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this-week-in-rust · 2 years ago

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This Week in Rust 480

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @ThisWeekInRust on Twitter or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Official

Announcing Rust 1.67.0

Help test Cargo's new index protocol

Foundation

Rust Foundation Annual Report 2022

Newsletters

This Month in Rust GameDev #41 - December 2022

Project/Tooling Updates

Scaphandre 0.5.0, to measure energy consumption of IT servers and computers, is released : windows compatibility (experimental), multiple sensors support, and much more...

IntelliJ Rust Changelog #187

rust-analyzer changelog #166

argmin 0.8.0 and argmin-math 0.3.0 released

Fornjot (code-first CAD in Rust) - Weekly Release - The Usual Rabbit Hole

One step forward, an easier interoperability between Rust and Haskell

Managing complex communication over raw I/O streams using async-io-typed and async-io-converse

Autometrics - a macro that tracks metrics for any function & inserts links to Prometheus charts right into each function's doc comments

Observations/Thoughts

Ordering Numbers, How Hard Can It Be?

Next Rust Compiler

Forking Chrome to render in a terminal

40x Faster! We rewrote our project with Rust!

Moving and re-exporting a Rust type can be a major breaking change

What the HAL? The Quest for Finding a Suitable Embedded Rust HAL

Some Rust breaking changes don't require a major version

Crash! And now what?

Rust Walkthroughs

Handling Integer Overflow in Rust

Rust error handling with anyhow

Synchronizing state with Websockets and JSON Patch

Plugins for Rust

[series] Protohackers in Rust, Part 00: Dipping the toe in async and Tokio

Building gRPC APIs with Rust using Tonic

Miscellaneous

Rust's Ugly Syntax

[video] Rust's Witchcraft

[DE] CodeSandbox: Nun auch für die Rust-Entwicklung

Crate of the Week

This week's crate is symphonia, a collection of pure-Rust audio decoders for many common formats.

Thanks to Kornel for the suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but did not know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

diesel - Generate matching SQL types for Mysql enums

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from the Rust Project

377 pull requests were merged in the last week

move format_args!() into AST (and expand it during AST lowering)

implement Hash for proc_macro::LineColumn

add help message about function pointers

add hint for missing lifetime bound on trait object when type alias is used

add suggestion to remove if in let..else block

assume MIR types are fully normalized in ascribe_user_type

check for missing space between fat arrow and range pattern

compute generator saved locals on MIR

core: support variety of atomic widths in width-agnostic functions

correct suggestions for closure arguments that need a borrow

detect references to non-existant messages in Fluent resources

disable ConstGoto opt in cleanup blocks

don't merge vtables when full debuginfo is enabled

fix def-use dominance check

fix thin archive reading

impl DispatchFromDyn for Cell and UnsafeCell

implement simple CopyPropagation based on SSA analysis

improve proc macro attribute diagnostics

insert whitespace to avoid ident concatenation in suggestion

only compute mir_generator_witnesses query in drop_tracking_mir mode

preserve split DWARF files when building archives

recover from more const arguments that are not wrapped in curly braces

reimplement NormalizeArrayLen based on SsaLocals

remove overlapping parts of multipart suggestions

special-case deriving PartialOrd for enums with dataless variants

suggest coercion of Result using ?

suggest qualifying bare associated constants

suggest using a lock for *Cell: Sync bounds

teach parser to understand fake anonymous enum syntax

use can_eq to compare types for default assoc type error

use proper InferCtxt when probing for associated types in astconv

use stable metric for const eval limit instead of current terminator-based logic

remove optimistic spinning from mpsc::SyncSender

stabilize the const_socketaddr feature

codegen_gcc: fix/signed integer overflow

cargo: cargo add check [dependencies] order without considering the dotted item

cargo: avoid saving the same future_incompat warning multiple times

cargo: fix split-debuginfo support detection

cargo: make cargo aware of dwp files

cargo: mention current default value in publish.timeout docs

rustdoc: collect rustdoc-reachable items during early doc link resolution

rustdoc: prohibit scroll bar on source viewer in Safari

rustdoc: use smarter encoding for playground URL

rustdoc: add option to include private items in library docs

fix infinite loop in rustdoc get_all_import_attributes function

rustfmt: don't wrap comments that are part of a table

rustfmt: fix for handling empty code block in doc comment

clippy: invalid_regex: show full error when string value doesn't match source

clippy: multiple_unsafe_ops_per_block: don't lint in external macros

clippy: improve span for module_name_repetitions

clippy: missing config

clippy: prevents len_without_is_empty from triggering when len takes arguments besides &self

rust-analyzer: adding section for Visual Studio IDE Rust development support

rust-analyzer: don't fail workspace loading if sysroot can't be found

rust-analyzer: improve "match to let else" assist

rust-analyzer: show signature help when typing record literal

rust-analyzer: ide-assists: unwrap block when it parent is let stmt

rust-analyzer: fix config substitution failing extension activation

rust-analyzer: don't include lifetime or label apostrophe when renaming

rust-analyzer: fix "add missing impl members" assist for impls inside blocks

rust-analyzer: fix assoc item search finding unrelated definitions

rust-analyzer: fix process-changes not deduplicating changes correctly

rust-analyzer: handle boolean scrutinees in match <-> if let replacement assists better

rust-analyzer: substitute VSCode variables more generally

Rust Compiler Performance Triage

Overall a positive week, with relatively few regressions overall and a number of improvements.

Triage done by @simulacrum. Revision range: c8e6a9e..a64ef7d

Summary:

(instructions:u) mean range count Regressions ❌ (primary) 0.6% [0.6%, 0.6%] 1 Regressions ❌ (secondary) 0.3% [0.3%, 0.3%] 1 Improvements ✅ (primary) -0.8% [-2.0%, -0.2%] 27 Improvements ✅ (secondary) -0.9% [-1.9%, -0.5%] 11 All ❌✅ (primary) -0.8% [-2.0%, 0.6%] 28

2 Regressions, 4 Improvements, 6 Mixed; 2 of them in rollups 44 artifact comparisons made in total

Full report here

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

Create an Operational Semantics Team

Final Comment Period

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

RFCs

No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

[disposition: merge] Stabilize feature cstr_from_bytes_until_nul

[disposition: merge] Support true and false as boolean flag params

[disposition: merge] Implement AsFd and AsRawFd for Rc

[disposition: merge] rustdoc: compute maximum Levenshtein distance based on the query

New and Updated RFCs

[new] Permissions

[new] Add text for the CFG OS Version RFC

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

Feature: Help test Cargo's new index protocol

If you are a feature implementer and would like your RFC to appear on the above list, add the new call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

Upcoming Events

Rusty Events between 2023-02-01 - 2023-03-01 🦀

Virtual

2023-02-01 | Virtual (Cardiff, UK) | Rust and C++ Cardiff

New Year Virtual Social + Share

2023-02-01 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

2023-02-01 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Reactor New York and Microsoft Reactor San Francisco

Primeros pasos con Rust: QA y horas de comunidad | New York Mirror | San Francisco Mirror

2023-02-01 | Virtual (Stuttgart, DE) | Rust Community Stuttgart

Rust-Meetup

2023-02-06 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Reactor New York and Microsoft Reactor San Francisco

Primeros pasos con Rust - Implementación de tipos y rasgos genéricos | New York Mirror | San Francisco Mirror

2023-02-07 | Virtual (Beijing, CN) | WebAssembly and Rust Meetup (Rustlang)

Monthly WasmEdge Community Meeting, a CNCF sandbox WebAssembly runtime

2023-02-07 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

Buffalo Rust User Group, First Tuesdays

2023-02-07 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Reactor New York and Microsoft Reactor San Francisco

Primeros pasos con Rust - Módulos, paquetes y contenedores de terceros | New York Mirror | San Francisco Mirror

2023-02-08 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust

Monthly Meetup

2023-02-08 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Rector New York and Microsoft Reactor San Francisco

Primeros pasos con Rust: QA y horas de comunidad | New York Mirror | San Francisco Mirror

2023-02-09 | Virtual (Nürnberg, DE) | Rust Nuremberg

Rust Nürnberg online

2023-02-11 | Virtual | Rust GameDev

Rust GameDev Monthly Meetup

2023-02-13 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Rector New York and Microsoft Reactor San Francisco

Primeros pasos con Rust - Escritura de pruebas automatizadas | New York Mirror | San Francisco Mirror

2023-02-14 | Virtual (Berlin, DE) | OpenTechSchool Berlin

Rust Hack and Learn

2023-02-14 | Virtual (Dallas, TX, US) | Dallas Rust

Second Tuesday

2023-02-14 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US) | Microsoft Reactor Redmond and Microsoft Rector New York and Microsoft Reactor San Francisco

Primeros pasos con Rust - Creamos un programa de ToDos en la línea de comandos | San Francisco Mirror | New York Mirror

2023-02-14 | Virtual (Saarbrücken, DE) | Rust-Saar

Meetup: 26u16

2023-02-15 | Virtual (Redmond, WA, US; New York, NY, US; San Francisco, CA, US; São Paulo, BR) | Microsoft Reactor Redmond and Microsoft Rector New York and Microsoft Reactor San Francisco and Microsoft Reactor São Paulo

Primeros pasos con Rust: QA y horas de comunidad | San Francisco Mirror | New York Mirror | São Paulo Mirror

2023-02-15 | Virtual (Vancouver, BC, CA) | Vancouver Rust

Rust Study/Hack/Hang-out

2023-02-21 | Virtual (Washington, DC, US) | Rust DC

Mid-month Rustful

2023-02-23 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup

Tock, a Rust based Embedded Operating System

2023-02-23 | Virtual (Kassel, DE) | Java User Group Hessen

Eine Einführung in Rust (Stefan Baumgartner)

2023-02-28 | Virtual (Berlin, DE) | Open Tech School Berlin

Rust Hack and Learn

2023-02-28 | Virtual (Dallas, TX, US) | Dallas Rust

Last Tuesday

2023-03-01 | Virtual (Indianapolis, IN, US) | Indy Rust

Indy.rs - with Social Distancing

Asia

2023-02-01 | Kyoto, JP | Kansai Rust

Rust talk: How to implement Iterator on tuples... kind of

2023-02-20 | Tel Aviv, IL | Rust TLV

February Edition - Redis and BioCatch talking Rust!

Europe

2023-02-02 | Berlin, DE | Prenzlauer Berg Software Engineers

PBerg engineers - inaugural meetup; Lukas: Serverless APIs using Rust and Azure functions (Fee)

2023-02-02 | Hamburg, DE | Rust Meetup Hamburg

Rust Hack & Learn February 2023

2023-02-02 | Lyon, FR | Rust Lyon

Rust Lyon meetup #01

2023-02-04 | Brussels, BE | FOSDEM

FOSDEM 2023 Conference: Rust devroom

2023-02-09 | Lille, FR | Rust Lille

Rust Lille #2

2023-02-15 | London, UK | Rust London User Group

Rust Nation Pre-Conference Reception with The Rust Foundation

2023-02-15 | Trondheim, NO | Rust Trondheim

Rust New Year's Resolution Bug Hunt

2023-02-16, 2023-02-17 | London, UK | Rust Nation UK

Rust Nation '23

2023-02-18 | London, UK | Rust London User Group

Post-Conference Rust in Enterprise Brunch Hosted at Red Badger

2023-02-21 | Zurich, CH | Rust Zurich

Practical Cryptography - February Meetup (Registration opens 7 Feb 2023)

2023-02-23 | Copenhagen, DK | Copenhagen Rust Community

Rust metup #33

North America

2023-02-09 | Mountain View, CA, US | Mountain View Rust Study Group

Rust Study Group at Hacker Dojo

2023-02-09 | New York, NY, US | Rust NYC

A Night of Interop: Rust in React Native & Rust in Golang (two talks)

2023-02-13 | Minneapolis, MN, US | Minneapolis Rust Meetup

Happy Hour and Beginner Embedded Rust Hacking Session (#3!)

2023-02-21 | San Francisco, CA, US | San Francisco Rust Study Group

Rust Hacking in Person

2023-02-23 | Lehi, UT, US | Utah Rust

Upcoming Event

Oceania

2023-02-28 | Canberra, ACT, AU | Canberra Rust User Group

February Meetup

2023-03-01 | Sydney, NSW, AU | Rust Sydney

🦀 Lightning Talks - We are back!

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

Compilers are an error reporting tool with a code generation side-gig.

– Esteban Küber on Hacker News

Thanks to Stefan Majewsky for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

#rust-lang #rust #rustlang #twir #long post

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answerlock3 · 4 years ago

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Sql Interview Questions

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Prospects are most likely to be asked standard SQL interview concerns to progress degree SQL concerns relying on their experience and different other aspects. The listed below list covers all the SQL meeting concerns for betters in addition to SQL interview questions for knowledgeable degree candidates as well as some SQL question meeting concerns. SQL provision helps to restrict the outcome set by offering a problem to the query. A clause assists to filter the rows from the entire set of records. Our SQL Meeting Questions blog site is the one-stop source where you can improve your meeting prep work. It has a set of leading 65 concerns which an interviewer intends to ask throughout an interview procedure. Unlike primary vital, there can be numerous distinct restrictions specified per table. The code syntax for UNIQUE is rather comparable to that of PRIMARY SECRET and can be utilized mutually. A lot of modern data source management systems like MySQL, Microsoft SQL Server, Oracle, IBM DB2 as well as Amazon Redshift are based upon RDBMS. SQL clause is specified to restrict the result set by providing problem to the query. This typically filterings system some rows from the whole collection of records. Cross join can be defined as a cartesian product of both tables included in the join. The table after sign up with contains the same number of rows as in the cross-product of number of rows in the two tables. Self-join is set to be query made use of to contrast to itself. This is utilized to contrast values in a column with other worths in the exact same column in the same table. PEN NAME ES can be utilized for the same table contrast. This is a key words used to inquire information from even more tables based upon the partnership between the areas of the tables. A international trick is one table which can be associated with the main key of another table. Partnership requires to be produced in between 2 tables by referencing international key with the main key of another table. A Distinct essential restraint uniquely recognized each record in the data source. It begins with the fundamental SQL interview questions and later on remains to sophisticated inquiries based on your conversations and also solutions. These SQL Interview concerns will aid you with various knowledge levels to reap the optimum take advantage of this blog. A table has a specified number of the column called fields however can have any kind of variety of rows which is called the document. So, the columns in the table of the database are called the fields and they represent the feature or attributes of the entity in the document. Rows below describes the tuples which stand for the easy data item and also columns are the quality of the information products existing particularly row. Columns can classify as vertical, as well as Rows are straight. 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A table has specified number of column called areas but can have any kind of number of rows which is called record. RDBMS save the data into the collection of tables, which is connected by common areas between the columns of the table. It also provides relational operators to manipulate the information stored into the tables. Adhering to is a curated listing of SQL interview concerns as well as answers, which are most likely to be asked during the SQL meeting.

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smsjust · 3 years ago

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Delete mysql

#Delete mysql code

Do you need to create the tables in the target database before populating them? You'll need to add additional transformations to read the metadata of the table to create and build the script to create said table in the target database before populating it.

You can read the dictionary tables in the source database to inject the information about table names and columns to the transformations so you don't create one pair of transformations for each table.

Do you need to replicate a whole database instead of just one table? You'll need to add steps to work with Metadata Injection, so you run the first a second transformations for all the tables in the source database.

Now, you can complicate matters from this depending on your situation: To check the number of deleted rows, call the ROWCOUNT () function described in Section 12.16, Information Functions. You can use this command at the mysql> prompt as well as. LIMIT rowcount The DELETE statement deletes rows from tblname and returns the number of deleted rows. If you want to delete a record from any MySQL table, then you can use the SQL command DELETE FROM. If we want to remove records from 'newauthor' table with following conditions - 1. DELETE LOWPRIORITY QUICK IGNORE FROM tblname PARTITION (partitionname, partitionname. You can delete records in a single table at. You can specify any condition using the WHERE clause. DELETE FROM tablename WHERE Clause If the WHERE clause is not specified, then all the records will be deleted from the given MySQL table. I had to run the last command because Ubuntu sometimes keeps some libs even you try to purge them all. sudo apt-get remove -purge mysql-server mysql-client mysql-common sudo apt-get autoremove sudo rm -rf /var/lib/mysql.

#Delete mysql code

This is useful when you want to delete rows depending upon a complex condition. The following code block has a generic SQL syntax of the DELETE command to delete data from a MySQL table. My solution was to completely remove MySQL from Ubuntu 13.10 and fresh installation. A subquery can be used with MySQL DELETE statement. Job: After successfully running First transformation run the second transformation or the step. Example: MySQL DELETE rows using subqueries with alias and EXISTS.Just check what you have available in Pentaho, I don't have it opened at the moment to verify. The DELETE statement is used to delete existing records in a table. I don't remember if there's a specific step for this or if you could use a job step instead of a transformation running a SQL script to truncate the table. Second transformation: Truncate table in Source database.Instead, use PURGE BINARY LOGS TO mysql-bin.010 as the root. First transformation: Table input step to read table data from source database and Table output step to write said data to table in target database The server can get seriously irritated if you delete them with rm.Just run two transformations and one job:

#Delete mysql

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webstorm-crack-op · 3 years ago

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webstorm-crack-rd · 3 years ago

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krishna337 · 3 years ago

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SQL Aliases

The alias are temporary names given to a table or column for a specific SQL query.It is used when a column or table name is used without its original names, but the modified name is only temporary. Syntax Coulmn Alias Syntax: SELECT column1, column2 .... FROM tablename AS aliasname WHERE condition; Table Alias Syntax: SELECT columnname AS aliasname FROM tablename WHERE condition; Example For…

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firsttimeinterview · 4 years ago

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Sql Interview Questions

If a WHERE provision is used in cross join after that the inquiry will certainly work like an INNER SIGN UP WITH. A UNIQUE constraint makes sure that all values in a column are various. This provides uniqueness for the column and aids recognize each row distinctively. It promotes you to control the information kept in the tables by utilizing relational operators. Examples of the relational database management system are Microsoft Gain access to, MySQL, SQLServer, Oracle database, etc. One-of-a-kind crucial constraint distinctly identifies each record in the data source. This crucial offers uniqueness for the column or collection of columns. A database cursor is a control structure that enables traversal of records in a database. Cursors, furthermore, facilitates handling after traversal, such as retrieval, enhancement and also removal of database records. They can be viewed as a guideline to one row in a collection of rows. An pen names is a attribute of SQL that is supported by most, if not all, RDBMSs. It is a temporary name assigned to the table or table column for the function of a particular SQL inquiry. In addition, aliasing can be employed as an obfuscation method to protect the real names of database areas. A table pen name is also called a relationship name. trainees; Non-unique indexes, on the other hand, are not made use of to impose restrictions on the tables with which they are associated. Instead, non-unique indexes are utilized exclusively to boost query performance by preserving a sorted order of information values that are used often. A database index is a information structure that provides quick lookup of information in a column or columns of a table. It boosts the speed of operations accessing data from a data source table at the expense of additional creates and memory to preserve the index data framework. Candidates are most likely to be asked standard SQL meeting questions to advance degree SQL questions depending upon their experience as well as numerous other aspects. The listed below list covers all the SQL meeting questions for betters along with SQL meeting concerns for seasoned level candidates and also some SQL inquiry meeting concerns. SQL stipulation helps to limit the result established by offering a condition to the question. A stipulation aids to filter the rows from the whole set of records. Our SQL Interview Questions blog site is the one-stop source from where you can boost your meeting prep work. It has a collection of leading 65 concerns which an recruiter intends to ask throughout an interview process. Unlike https://geekinterview.net , there can be numerous unique restraints defined per table. The code syntax for UNIQUE is rather similar to that of PRIMARY SECRET and can be made use of mutually. The majority of modern data source monitoring systems like MySQL, Microsoft SQL Web Server, Oracle, IBM DB2 and Amazon.com Redshift are based upon RDBMS. SQL provision is defined to limit the outcome established by giving condition to the inquiry. This usually filterings system some rows from the entire set of records. Cross join can be specified as a cartesian product of the two tables included in the join. The table after join contains the same variety of rows as in the cross-product of number of rows in both tables. Self-join is readied to be query made use of to contrast to itself. This is made use of to compare worths in a column with other values in the exact same column in the exact same table. ALIAS ES can be made use of for the very same table comparison. This is a search phrase made use of to quiz information from even more tables based upon the connection between the areas of the tables. A foreign trick is one table which can be connected to the primary trick of one more table. Relationship requires to be produced in between 2 tables by referencing international key with the main secret of one more table. A Unique vital restraint distinctly recognized each record in the data source. It starts with the basic SQL meeting questions as well as later continues to sophisticated concerns based on your conversations and also responses. These SQL Meeting inquiries will assist you with different knowledge levels to gain the optimum gain from this blog site. A table has a defined number of the column called areas however can have any type of variety of rows which is referred to as the document. So, the columns in the table of the data source are known as the fields and also they stand for the quality or characteristics of the entity in the document. Rows right here refers to the tuples which stand for the simple information item as well as columns are the quality of the information items existing in particular row. Columns can classify as vertical, and also Rows are horizontal. There is provided sql meeting questions and responses that has actually been asked in lots of firms. For PL/SQL meeting questions, see our next page.

A sight can have information from several tables integrated, and it relies on the connection. Views are used to use security device in the SQL Server. The sight of the database is the searchable item we can make use of a inquiry to look the deem we utilize for the table. RDBMS stands for Relational Data source Management System. It is a data source administration system based on a relational model. RDBMS stores the information right into the collection of tables as well as links those table using the relational operators conveniently whenever needed. This offers uniqueness for the column or collection of columns. go to my blog is a collection of data that are organized in a design with Columns as well as Rows. https://bit.ly/3tmWIsh can be categorized as vertical, as well as Rows are straight. A table has specified number of column called areas however can have any kind of variety of rows which is called document. RDBMS save the data into the collection of tables, which is connected by typical areas between the columns of the table. https://tinyurl.com/c7k3vf9t provides relational drivers to control the information saved into the tables. Complying with is a curated checklist of SQL meeting inquiries and also responses, which are likely to be asked throughout the SQL interview.

#sql interview questions #sql interview questions and answers #sql

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interviewexperttips · 4 years ago

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Sql Interview Questions

If a WHERE condition is made use of in cross sign up with after that the query will work like an INNER SIGN UP WITH. A UNIQUE restriction ensures that all worths in a column are different. This gives uniqueness for the column as well as helps determine each row distinctively. It promotes you to manipulate the information saved in the tables by using relational drivers. Examples of the relational data source monitoring system are Microsoft Access, MySQL, SQLServer, Oracle data source, and so on. Distinct vital constraint uniquely identifies each record in the data source. This crucial supplies uniqueness for the column or collection of columns. A database cursor is a control structure that allows for traversal of documents in a database. Cursors, additionally, assists in handling after traversal, such as retrieval, enhancement and deletion of database records. They can be viewed as a reminder to one row in a collection of rows. An pen names is a attribute of SQL that is supported by many, if not all, RDBMSs. It is a temporary name designated to the table or table column for the objective of a specific SQL inquiry. In look at this site , aliasing can be used as an obfuscation method to safeguard the actual names of database areas. A table alias is likewise called a connection name. pupils; Non-unique indexes, on the other hand, are not made use of to implement constraints on the tables with which they are linked. Rather, non-unique indexes are made use of solely to enhance inquiry performance by maintaining a arranged order of information worths that are used frequently. A database index is a data framework that supplies fast lookup of information in a column or columns of a table. It boosts the rate of procedures accessing information from a database table at the price of extra creates as well as memory to keep the index data structure. Candidates are most likely to be asked basic SQL interview concerns to progress level SQL concerns depending upon their experience and numerous other variables. The listed below listing covers all the SQL meeting questions for betters as well as SQL interview concerns for experienced degree candidates and some SQL query meeting concerns. SQL condition helps to restrict the outcome established by providing a problem to the query. A stipulation helps to filter the rows from the entire set of documents. Our SQL Meeting Questions blog is the one-stop source where you can increase your interview preparation. It has a collection of leading 65 concerns which an recruiter prepares to ask during an interview procedure. Unlike main vital, there can be several distinct constraints defined per table. The code syntax for UNIQUE is quite similar to that of PRIMARY TRICK and can be made use of interchangeably. A lot of modern data source administration systems like MySQL, Microsoft SQL Server, Oracle, IBM DB2 and also Amazon.com Redshift are based on RDBMS. SQL provision is specified to restrict the result established by providing problem to the query. This normally filters some rows from the whole collection of records. Cross join can be specified as a cartesian item of the two tables consisted of in the sign up with. The table after sign up with includes the exact same number of rows as in the cross-product of number of rows in both tables. Self-join is readied to be query utilized to compare to itself. https://tinyurl.com/c7k3vf9t is made use of to compare values in a column with other worths in the exact same column in the exact same table. PEN NAME ES can be made use of for the same table comparison. This is a key words made use of to quiz information from more tables based on the partnership between the areas of the tables. A international trick is one table which can be connected to the primary trick of another table. Relationship requires to be produced in between 2 tables by referencing foreign secret with the main secret of another table. A Unique crucial restriction distinctively determined each document in the database. It starts with the standard SQL interview concerns and later on remains to innovative concerns based on your conversations and solutions. These SQL Interview inquiries will certainly help you with various competence levels to reap the optimum take advantage of this blog site. A table consists of a specified number of the column called areas yet can have any kind of variety of rows which is referred to as the record. So, the columns in the table of the database are known as the areas and they stand for the characteristic or features of the entity in the record. Rows here describes the tuples which stand for the easy data thing and columns are the characteristic of the data products present particularly row. Columns can classify as upright, and Rows are straight. There is given sql interview concerns and also answers that has been asked in several firms. For PL/SQL interview concerns, see our following page. A sight can have data from one or more tables incorporated, and it relies on the relationship. https://geekinterview.net are used to use safety mechanism in the SQL Web server. The sight of the database is the searchable object we can utilize a question to browse the deem we make use of for the table. RDBMS represents Relational Database Administration System. It is a data source management system based upon a relational model. RDBMS shops the data into the collection of tables and also links those table utilizing the relational drivers conveniently whenever needed. This supplies individuality for the column or set of columns. A table is a set of information that are arranged in a version with Columns and Rows. Columns can be classified as vertical, as well as Rows are horizontal. A table has actually defined number of column called fields but can have any kind of number of rows which is called document. RDBMS keep the data into the collection of tables, which is connected by typical areas in between the columns of the table. It likewise provides relational operators to control the data kept right into the tables. Following is a curated checklist of SQL meeting inquiries and responses, which are most likely to be asked throughout the SQL interview.

#sql interview questions #sql interview questions and answers #sql

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trendingjobs · 4 years ago

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Sql Meeting Questions

If a IN WHICH stipulation is used in cross join after that the inquiry will certainly work like an INNER JOIN. A DISTINCT restriction ensures that all values in a column are different. This gives originality for the column and helps identify each row uniquely. It facilitates you to adjust the data stored in the tables by using relational drivers. Instances of the relational data source administration system are Microsoft Gain access to, MySQL, SQLServer, Oracle database, and so on. Unique key restriction distinctly identifies each document in the data source. This vital supplies individuality for the column or set of columns. A data source arrow is a control framework that enables traversal of documents in a data source. Cursors, furthermore, helps with handling after traversal, such as access, enhancement and also deletion of data source documents. They can be deemed a pointer to one row in a set of rows. An alias is a function of SQL that is sustained by many, if not all, RDBMSs. It is a short-lived name assigned to the table or table column for the objective of a particular SQL question. In addition, aliasing can be used as an obfuscation technique to protect the genuine names of database fields. A table pen name is additionally called a connection name. trainees; Non-unique indexes, on the other hand, are not used to apply restraints on the tables with which they are connected. Rather, non-unique indexes are used solely to improve inquiry efficiency by keeping a arranged order of information worths that are made use of frequently. A database index is a data framework that offers fast lookup of data in a column or columns of a table. It boosts the speed of operations accessing data from a database table at the price of added writes as well as memory to maintain the index information structure. Candidates are most likely to be asked fundamental SQL interview concerns to advance level SQL inquiries depending upon their experience and also numerous other aspects. The listed below list covers all the SQL meeting questions for betters as well as SQL interview inquiries for knowledgeable degree candidates and also some SQL query meeting inquiries. SQL clause helps to restrict the outcome set by offering a problem to the inquiry. A clause helps to filter the rows from the entire set of documents. Our SQL Meeting Questions blog site is the one-stop source from where you can boost your interview preparation. It has a collection of leading 65 questions which an recruiter intends to ask during an meeting procedure. Unlike primary essential, there can be several one-of-a-kind restraints defined per table. The code syntax for UNIQUE is quite similar to that of PRIMARY TRICK and also can be made use of mutually. The majority of modern database management systems like MySQL, Microsoft SQL Server, Oracle, IBM DB2 as well as Amazon Redshift are based upon RDBMS. SQL provision is defined to limit the result established by offering condition to the inquiry. https://tinyurl.com/c7k3vf9t from the whole set of documents. Cross join can be defined as a cartesian item of the two tables included in the join. The table after join contains the exact same variety of rows as in the cross-product of variety of rows in the two tables. Self-join is set to be query utilized to contrast to itself. This is used to contrast worths in a column with other values in the very same column in the very same table. PEN NAME ES can be made use of for the exact same table comparison. This is a key phrase utilized to quiz data from more tables based upon the relationship in between the areas of the tables. A international secret is one table which can be associated with the main secret of one more table. Relationship requires to be produced in between two tables by referencing international trick with the main secret of an additional table. A Distinct vital restraint distinctively identified each record in the data source. It starts with the fundamental SQL interview inquiries and also later on continues to sophisticated concerns based upon your conversations and also answers. These SQL Meeting questions will certainly assist you with different competence levels to enjoy the maximum gain from this blog site. A table has a specified number of the column called areas however can have any kind of variety of rows which is referred to as the document. So, webpage in the table of the data source are known as the fields and also they represent the attribute or qualities of the entity in the document. Rows below refers to the tuples which represent the simple information product as well as columns are the characteristic of the information products present in particular row. Columns can categorize as upright, as well as Rows are horizontal. There is given sql interview inquiries as well as solutions that has actually been asked in many companies. For PL/SQL interview questions, see our following page. A sight can have information from several tables incorporated, and it depends on the partnership. Views are made use of to apply safety and security system in the SQL Server. The sight of the database is the searchable things we can use a inquiry to search the consider as we make use of for the table. RDBMS represents Relational Database Administration System. It is a database management system based upon a relational model. RDBMS stores the data right into the collection of tables as well as links those table utilizing the relational drivers conveniently whenever called for.

This provides originality for the column or collection of columns. facebook sql interview questions is a set of data that are organized in a model with Columns and Rows. https://geekinterview.net can be classified as upright, as well as Rows are straight. A table has specified variety of column called fields however can have any number of rows which is called document. RDBMS store the information right into the collection of tables, which is associated by common areas between the columns of the table. It also gives relational operators to control the data stored into the tables. Complying with is a curated list of SQL interview inquiries and solutions, which are most likely to be asked during the SQL meeting.

#sql interview questions #sql interview questions and answers #sql

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phungthaihy · 5 years ago

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siva3155 · 5 years ago

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300+ TOP BO Designer Interview Questions and Answers

BO Designer Interview Questions for freshers experienced :-

1. What is Designer? The Universe designer uses DESIGNER to design, create and maintain universes for a particular group of users. A universe designer can distribute a universe as a file through the file system, or by exporting it to a repository. DESIGNER is a Business Objects product intended specifically for you the Universe designer. It is important to analyze the type of information that the end users at your site will require so that you can develop universes that meet the needs of the user community. This includes the actual reports, information, or results likely to be required by the end users. 2. What is Universe? A universe is a mapping of the data structure found in databases: tables, columns, joins. A universe is made up of classes, objects and conditions. A universe is the semantic layer that isolates the end user from the technical issues of the database structure. 3. How do you start creating the universe? Universe can be created by taking into consideration the type of data and the logical structure of your company’s databases. Creating of the universe starts with gathering of user requirements, identifying the database tables where the data resides, inserting the db structure to the universe, creating classes and objects from the db tables, and creating measures. Creating the joins between the tables, resolving loops either by creating aliases or contexts. Finally testing & deploying. 4. List some functions to create objects in the universe? @Aggregate_Aware, @Prompt, @Select, @Variable, Running Sum, Running Count, User Response, String functions, Date functions. 5. How a Universe is identified? A universe is identified by: a file name which consists of up to 8 characters and a .unv extension. a long name which consists of up to 35 characters. a unique system identifier. This is the identifier assigned by the repository when you export the universe. This identifier is null if you have never exported the universe. 6. How do you distribute a universe? There are two ways to distribute a universe to end users or another designer: 1) Exporting to Repository (2) Through File system – Moving it as a file through the file Server. 7. What is a Class? A class is a logical grouping of objects and conditions within a universe. 8. What is an Object? An object maps to data or a derivation of data in the database. 9. How can we qualify an object? An object can be qualified as a dimension, a detail, or a measure. Dimension objects retrieve character-type data that will provide the basis for analysis in a report. A detail object is always associated to one dimension object, on which it provides additional information. Measure objects retrieve numeric data that is the result of calculations on data in the database. A measure object is derived from an aggregate function: Count, Sum, Minimum, or Maximum. 10. What is the difference between conditional objects and other objects? Conditional objects have a where clause, where normal objects do not have a where clause

BO Designer Interview Questions 11. What type of connections Designer provides? DESIGNER provides three types of connections: (Tools ? Connections) Secured connection (Default): Stores the connection in the security domain of the BO repository to centralize and control access to sensitive or critical data. Designers and supervisors have the right to create this type of connection. Shared connection: Specifies that multiple users share the connection. All users who have access to this connection can use it and edit it. If you installed BO in Stand-Alone mode, the connection by default is stored in the sdac.lsi file (LocData subfolder). If you installed BO in Shared mode, the connection by default is stored in the sdac.ssi file (ShData subfolder). Designers and users have the right to create this type of connection. Personal connection: Specifies that the connection belong to the user who defined it. Other users cannot use or modify the connection. If you installed BO in Stand-Alone mode, the connection by default is stored in the pdac.lsi file (LocData subfolder). If you installed BusinessObjects in Shared mode, the connection by default is stored in the pdac.ssi file (ShData subfolder). Designers and users have the right to create this type of connection. 12. What are Universe parameters? These parameters define the universe. They are Definition, Summary, Strategies, Controls, SQL and Links. Summary Statistics of objects, joins, conditions, classes, contexts, hierarchies and alias in a universe. We get it from the Summary tab of the Universe parameters or File ? Parameters. Controls The Control settings allow to limit the size of the result set and the execution time of queries. SQL These parameter controls the query (allows use of subqueries, allows use of union, intersect and minus operators) and SQL generation options for the universe. Links This links tab is used with dynamically linked universes. 13. What are Strategies? A strategy is a script that automatically extracts structural information from a database or flat file. There are two types of strategies: Built-in strategies External strategies. 14. What is Build -in Strategy? DESIGNER uses the following built-in strategies for creating the components of universes: The Objects Creation strategy, which tells DESIGNER how to define classes and objects automatically from the database’s tables and columns. The Joins Creation strategy, which tells DESIGNER how to define joins automatically from the database’s tables and columns. The Table Browser strategy, which tells DESIGNER how to read the table and column structures from the database’s data dictionary. 15. What is External strategy? In the external strategy file you can customize an existing strategy or create your own. External strategy files are named according to the following convention: StxxxxEN.txt where St means strategy, xxxx is an abbreviation for the RDBMS, and EN is the language in which Business Objects products are installed (EN =English) For Oracle: Stora7en.txt in the Oracle folder 16. What is the list mode? List mode command (View ? List Mode) provides list of all the tables, joins, and contexts. 17. What is a join? A join is a relational operation that causes two or more tables with a common domain to be combined into a single table. The purpose of joins is to restrict the result set of a query run against multiple tables. DESIGNER supports: • Equi-joins • Theta joins • Outer joins • Shortcut joins Equi or Inner or Natural or Simple join: is based on the equality between the values in the column of one table and the values in the column of another. Because the same column is present in both tables, the join synchronizes the two tables. Self-Join: join a table to itself i.e create a self-join to find rows in a table that have values in common with other rows in the same table. Theta or Non-Equi join: links tables based on a relationship other than equality between two columns. Outer join: links two tables, one of which has rows that do not match those in the common column of the other table. Left Outer Join: All records from first table with matching rows from second. Right Outer Join: All records from second-named table with matching rows from left. Full outer join: All rows in all joined tables are included, whether they are matched or not. Shortcut join: can be used in schemas containing redundant join paths leading to the same result, regardless of direction. Improves SQL performance. 18. What is Cardinality? Cardinality expresses the minimum and maximum number of instances of an entity B that can be associated with an instance of an entity A. The minimum and the maximum number of instances can be equal to 0, 1, or N. Cardinalities indicate whether the relationship or join between two tables is one-to-many (1,N), one-to-one (1,1), or many-to-many (N, N). Because a join is bi-directional, it must always have two cardinalities. 19. What is a Cartesian product? A Cartesian product is the result of a query in which two or more tables are not linked by a join. If executed, the report shows results for each possible combination of each table row. 20. Why do you perform 'Integrity Check’? It detects any errors in the objects, joins, conditions, and cardinalities of your universe. It detects whether there are any loops in the joins. It detects whether contexts are necessary. It determines whether any changes were made to the database to which the universe is connected. 21. What is Parse checking? Parse checking means how DESIGNER is to determine the validity of an object, join, or condition. Quick parsing checks only the syntax of components. Thorough parsing checks both the syntax and semantics of components. 22. If there are changes in the database on which you have already created a universe, how do you include those additional changes into your universe? By refreshing the structure I get the updated database structure. 23. What are Lookup and Fact Tables? Lookup tables: A lookup (or dimension) table contains information associated with a particular entity or subject. Fact Tables: A fact table contains statistical information about transactions. 24. What Types of Join Paths Return Incorrect Results? 1. Loops (Too few rows) 2. Fan Trap (Too many rows) 3. Chasm Trap (Too many rows) 25. What Are Loops? In a relational database, a loop occurs when joins form multiple paths between lookup tables. 26. How to detect loops? Run the Check Integrity function, which indicates the existence of any loops. Select the Detect Loops command from the Tools menu. 27. How to resolve loops? Loops can be resolved by creating aliases and contexts. 28. What is an Alias? In SQL an alias is an alternative name for a table. In DESIGNER, an alias is just a pointer to another table. The purpose of aliases is to resolve structural issues in a database arising from SQL limitations. Whenever possible you should use an alias instead of a context. 29. What is a context? Context is a method by which Designer can decide which path to choose when more than one path is possible from one table to another in the universe. Generally used transactional database with multiple Fact tables. Dis-advantage: When you use a context, you expose the BO end user to the database structure. They are forced to decide which context they want to use to run their query. The role of the universe is to shield end users from the database structure, so they do not have to make such decisions. 30. What is Fan trap and Chasm Trap? How do you resolve? Fan Trap: occurs when a “One to Many” join links a table which is in turn linked by another “One to Many” join. There are two ways to solve Fan trap: • Creating an alias and applying aggregate awareness function. This is the most effective way to solve the Fan trap problem. • Using Multiple SQL statements for each measure. Chasm Trap: occurs when two “Many to one” joins from two Fact tables converge on a single Lookup table. Can be solved by: Creating a Context. Using Multiple SQL statements for each measure Creating multiple universes (WEBINTELLIGENCE only). 31. When do you use multiple universes? You can use multiple universes to solve a Chasm trap in a WEBINTELLIGENCE universe when Multiple SQL for Measures cannot be used as there are dimension objects defined for one or both of the fact tables. 32. When do you NOT use multiple universes? You do not use multiple universes in the following situations: Full client BUSINESSOBJECTS universes When a WEBINTELLIGENCE universe does not contain dimension objects defined for any of the fact tables. 33. What are @Functions? 1) @Aggregate_Aware (2) @Prompt (3) @Script (4) @Select (5) @Variable (6) @Where @Prompt: message prompts the end user to enter a specific value. Syntax: @Prompt (‘message’, , , , ) @Script: This function recovers the results of Visual Basic for Applications macro (VBA macro). Syntax: @Script (‘var_name’, ‘vartype’, ‘script_name’) @Select: This function enables you to re-use the Select statement of an existing object. Syntax: @Select (Classname\Objectname) @Variable: The @Variable is used to reference the value assigned to a name or variable. Syntax: @Variable(‘myname’) @Where: This function lets you re-use the Where clause of an existing object. Syntax: @Where (Classname\Objectname) 34. What is aggregate awareness? Is a function used to aggregate the data from table, is used to enhance the performance of SQL transactions; it determines which tables to use in SQL generation either aggregate or detailed tables. Precedence: left to right Syntax: @Aggregate_Aware (sum (table1.sal), sum (table2.sal)) Setting up Aggregate Awareness: Build the Objects: 1. Identify all the possible definitions (table/column combinations) of the objects. 2. Arrange the objects by level of aggregation. 3. Build the objects using the @Aggregate_Awareness function. Specify the incompatible objects 1. Build an objects/aggregate tables matrix. 2. For the first aggregate table, decide whether each object is either: - at the same level of aggregation or higher (compatible) - at a lower level of aggregation (incompatible) 3. Check only the boxes of objects that are incompatible for that table. 4. Repeat the steps for the remaining aggregate tables. Define any necessary contexts 1.Define one context per level of aggregation. Test the results 1. Run several queries. 2. Compare the results. 35. What are Object Security Access Levels? (Right click object?Edit?Advanced Tab) You can restrict an object so that only end users with the appropriate security access level can use it. Security access levels are assigned to user profiles by the supervisor from the Supervisor module. The levels are from highest to lowest: Private, Confidential, Restricted, Controlled, and Public (Default level). The higher the level, the fewer the number of users can access it. 36. What is Multidimensional Analysis? The purpose of multidimensional analysis is to organize data along a combination of “dimensions” and “hierarchies”. BUSINESSOBJECTS allows two types of multidimensional analyses: Slice and dice Drill (available only with the BUSINESSOBJECTS EXPLORER). 37. What is Enterprise Mode? Enterprise mode means working in an environment with a repository. Online and offline modes are options that apply when you are working in enterprise mode. Online mode: Online, the default mode, is appropriate for a networked environment in which the general supervisor has set up a repository. In online mode, you can import or export universes. Offline mode: Working in offline mode means essentially that you work with universes that are stored locally on your computer. To use this mode, you must have been connected at least once in online mode. 38. What is Workgroup Mode? Workgroup mode means working in an environment without a repository. 39. What is Incremental Export? DESIGNER can export a universe incrementally, meaning that it takes into account only the modifications made since the last export. 40. What is the method of migrating the universe across domains and/or repositories? The following are the steps followed while migrating a universe across repositories: First open the universe in the current repository and make the connection as shared. Save the Universe. (Save for all Users) Open the universe in the designer and export that to the required repository. Change the connection type from shared to secured. Note: Both the repositories must reside within the same database schema. 41. What are Linked Universes? Linked universes are universes that share common components such as parameters, classes, objects, or joins. 42. What are Linking of universes and how many levels of linking is possible? Creating a universe by taking the components from another universe. Only one level of linking is possible in BO. There are thee approaches to linking: 1. Kernel 2. Master 3. Component Disadvantages: Any change made to the master universe is reflected onto the derived universe. Designer does not save any list values, which may be associated with the linked universes. 43. What is the difference between linking and including the universes? Linking a universe is a process, which includes the required objects/classes of the master on to the derived universe. But any change made to the master universe is reflected onto the derived universe. Including a universe creates all the required objects from the master universe on to the derived universe; any change made to the master universe does not impact the derived universe. BO Designer Questions and Answers Pdf Download Read the full article

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