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Oracle SQL Interview Questions and Answers

Q1.) What is the difference between DML and DDL? Ans: DDL (Data Definition Language) is used mainly for defining the database schema. It consists of SQL statements which give an idea about the structure of the database. Some examples of DDL statements are: CREATE: Used to create new database objects ALTER: Used to alter characteristics of already existing database objects DROP: Used to remove database objects TRUNCATE: Used to remove all records including all spaces allocated to record from the table RENAME: Used to rename any database object DML (Data Manipulation Language) are responsible for managing and manipulating various data schemas or database objects. They cannot alter the characteristics of a database object unlike DDL statements. Most common examples are: SELECT: Used to retrieve data from the database INSERT: Used to insert new data/records into the database UPDATE: Used to update/modify the existing data/record from the database DELETE: Used to remove the existing data/record from the database Q2.) What does NVL function does? Ans: NVL function is mainly used to replace NULL values with some other value provided the data type of the NULL value to be replaced with the given value is same. Q3.) What is a BLOB data type? Ans: BLOB is a binary string of varying length used to store data up to 2 gigabytes. Images, videos and other documents can be stored in the database using BLOB data type. Q4.) What is the difference between varchar and varchar2? Ans: The data type varchar is used to stored data up to 2000 bytes while varchar2 is used to store data up to 4000 bytes. However, the prominent difference between varchar and varchar2 is that varchar can occupy NULL values while varchar2 cannot. Q5.) What are the different Oracle SQL database objects? Ans: Tables - Database object used to store various database records     Views - It is a virtual table derived from one or more tables     Indexes - Used to improve efficiency and performance of the database     Synonyms - Aliases used for database tables Q6.) What are various types of integrity constraints in Oracle SQL? Ans: Unique: It ensures that the given column or entity is unique and cannot be duplicated. Not NULL: It ensures that the given column cannot be empty. Foreign: It ensures that the two entities/tables share a common key with the one in parent table being a primary key and the one in child table being a foreign key. Q7.) What is a hash cluster? Ans: It is used to store table in a manner that query fetching results in faster data retrieval by using the hashing technique. Q8.) What is a sub query? Ans: Sub query refers to a query written with in a query. It is often referred to as nested query or inner query. It is used to apply filters on selected data retrieved by the main query. Q9.) What is an alert? Ans: A window appearing in the center of the screen overlaying the current screen to provide some form of information is termed as an alert. Q10.) Which is the fastest query method used to fetch data? Ans: Since Oracle uses clustering index technique, fetching records using ROWID is the fastest and the most efficient query method.If you looking for Oracle SQL Training in Bangalore, Sgraph Infotech is the best and top training center in marathahalli in Bangalore.

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How can we learn about Oracle SQL and PLSQL

Oracle SQL and PLSQL are easy to learn database management and programming language. Owing to the recent technological advancements the demand for Oracle SQL DBAs, PLSQL Developers and Oracle SQL Experts have soared. It has become a most sought after job profile by many technology enthusiasts and university students. However, it is not easy to master Oracle SQL. One must delve deep into the advanced concepts for clearly understanding the language effectively.

There are various ways in which one can learn Oracle SQL/PLSQL. From books to training institutes to online training portals. One can find a variety of choices to learn from given their preference and ability. Some of those are as follows:

W3Schools

The most popular and common web platform for learning and developing your SQL skills is W3Schools. Not only does it provide extensive guide in learning elementary SQL concepts but it also provides with reference guide, quizzes and practice projects to test your knowledge. You can even apply for W3Schools very own Oracle SQL certification program.

Tutorials point

Another popular website which can help you understand the basics and advanced concepts of Oracle SQL and PLSQL is Tutorialspoint. Besides from tutorials and reference material you can play around with SQL and PLSQL on their on line playground. They also have interview questions and exercises to help you practice.

Code academy

If you are looking to learn SQL and PLSQL the cool way this is where you should go. It offers practice projects and a separate tutorial project to help you learn SQL concepts. The only limitation of using Codecademy is the shortage of resource material and quizzes. However, they have a forum where you can post your doubts and queries and it will be answered.

Guru99.com

This website provides step by step resource guide for practicing each concept and tutorial. They also cover a huge variety of advanced and basic concepts. Even though, the content provided by them is quite good the absence of hands on practice limits the learning one can achieve.

Oracle

Another popular platform to learn from is the Oracle documentation library for SQL and PLSQL. It serves as the best knowledge base for learning. However, it is not quite user friendly and tedious task to exactly search for what you are looking makes it less preferable.

While you can easily learn and understand SQL and PLSQL from aforementioned websites the lack of practice may restrict you from reaching your full potential. Thus, it is advised to subscribe or apply to an Oracle SQL training offered by various training institutes across India.

Sgraph Infotech the most popular training institute offers a near perfect Oracle SQL and PLSQL training course in Bangalore with necessary preparation for the certification. The cherry on the cake is they even conduct placements for the trainees. The training material and the expertise of the professional Oracle instructors makes them an ideal choice to learn Oracle SQL and PLSQL from. They even provide dedicated support and other Oracle product related training for professionals too.

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What You Will Learn In The Android Training Program

What You Will Learn In The Android Training ProgramAndroid Training is most suggestive program for all candidates those who have been finished their graduation courses. Android training program is nothing but Android developing and it will describes the functionality that how to make the procedure to get develop the applications in various android mobiles. The installation structure involved on android mobiles are different for different users of mobile phones, so by going through training session of android program, candidates will come to know the details of entire procedure which illustrate the structure and assembling of applications and running method in the device which are accomplished with smart devices. Android training classes can start through online classes where as it will illustrates the specific topic which was completely related to android developing. It will expand the information that will get into particular task with sample code and re use of applications in your devices itself. Entire program of android developing will be classified into various groups such as found in six sessions. Students can get into all those presenting sessions at any time during the period of course as per their utility and understanding status. Institute or developers will assign the session of each for particular period of time and then made the session implement once the step of first session has been finished then went for next phase of training. After successful come over across all sessions of android develop training, candidates will get a perfect awareness about the program and also they can easily get into the portion of new development technique without any distortion. Various sites of training programs are available now days and going through online classes are easiest task than direct presence to institutes. Having training through online program is simple than going through offline classes at various places. Sitting at one place and go through the training session by using internet connection. Go through same developer program that illustrates the details of Android training for every day program. At first session, trainers will suggest the steps of essentials for android application development and they are going to new version of android application developer that should finish the classes in specified order. Video classes as well as audio classes are made available in online, so user can choose any of those as per their interest and convenience. Read More

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Future Career Prospect Of MSBI

Microsoft Business Intelligence is the powerful business tool designed by Microsoft that offers excellent solutions for queries related to Business Intelligence and Data Mining. This tool makes use of Microsoft Visual Studio Data Tools along with SQL Server.

Importance of MSBI:

MSBI allows the user to access the updated and accurate data which in turn facilitates proper decision making in the organisation. Different processes to be taken up in business intelligence require different set of tools for the solutions and MSBI provides the user with different tools to accomplish the task. It has an important application in Online Transaction Processing.

Business Intelligence has a very important role in almost all sorts of business in future. The obvious reason being handling of big data, its analysis and making smart decisions related to organisation is involved in every sector being IT, Engineering, Architecture, Banking, Government and Private agencies etc… and MSBI serves all the necessary requirements of BI

Future Aspects With MSBI

The business are now spread globally. The customer demands are increasing and to satisfy them and stay in the competitive environment successfully Business Intelligence is foremost requirement. Its perspectives in the future are detailed as follows:

Forecasting Using MSBI:

MSBI uses data mining tools and Predictive Analysis being the branch of data mining is beneficial in making future predictions by the analysis of present and the past data. The tool can help the organisations to work on their drawbacks, keep up with the strengths, understand the requirement of the customers in a better way and reduce the chances of occurrence of any loss and maximise the profit.

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What is MSBI

MSBI remains for Microsoft Business Intelligence. This intense suite is made out of tools which helps in giving best answers for Business Intelligence and Data Mining Queries. This tools utilizes Visual studio alongside SQL server. It enable clients to access precise and progressive data for better basic leadership in an association. It offers distinctive tools for various procedures which are required in Business Intelligence (BI) arrangements.

MSBI is isolated into 3 classifications:-

1. SSIS – SQL Server Integration Services 2. SSAS – SQL Server Analytical Services 3. SSRS – SQL Server Reporting Services

SSIS– SQL Server Integration Services :- SSIS: (Sql Server Integration Services) This tool is utilized for the coordination like tricking the information starting with one database then onto the next like from Oracle to SQL Server or from Excel to Sql Server and so on. This device is likewise utilized for mass exchanges in the database like embeddings lac's of records without a moment's delay. We can make the mix administrations modules which will carry out the employment adversary us.

SSAS– SQL Server Analytical Services - SSAS: (SQL Server Analysis Services) This apparatus is utilized to break down the execution of the sql server as far as load adjusting, overwhelming information, tranasction and so forth. So it is pretty much identified with adminsitration of the SQL Sevrer utilizing this device. This is intense instrument and through this we can examine the information embeddings into the database like what number of exchanges occurs in a moment and so forth.

SSRS– SQL Server Reporting Services - SSRS(SQL Server Reporting Services) This apparatus is identified with the era of report. This is exceptionally productive device as it is stage autonomous. We can produce the report utilizing this device and can use in an applications. Presently a days this is exceptionally prevalent in the market.

Few of the advantages of MSBI

1. Easy Data Exploration and Visualization 2. Managed Self-service BI tool 3. Full Use Of Native Excel Features 4. Dashboards And Scorecards 5. MSBI Support To Web Services 6. Complete End to End Business Solutions 7. MSBI Supports Data warehousing Applications

For More Information: MSBI Training Institutes in Bangalore

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Sgraphinfotech is one of the well known Training institute in Bangalore,We  provide certified courses  like Java, Pl/sql, MSBI, Big data, Hadoop etc. 

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SgraphInfotech is one of the well known training institute in Bangalore which is going to provide certified courses on Java, Hadoop,SQl/Pl,Bigdata etc.

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Who Should Take Hadoop Course

100 placement guarantee courses in bangalorePresentation

Hadoop is an Apache open source structure written in java that permits dispersed handling of substantial datasets crosswise over groups of PCs utilizing basic programming models. A Hadoop outline worked application works in a situation that gives dispersed capacity and calculation crosswise over groups of PCs. Hadoop is intended to scale up from single server to a great many machines, each offering nearby calculation and capacity.

As of late I came to realize that numerous understudies are mulling over taking this course and searching for additional data on the same. To help them settle on a more educated decision, I've explored the course and offered my info.

Perused on to discover more about this mainstream course and why it's been the beginning stage for a huge number of fruitful Big Data experts the world over.

What is the Objective of Hadoop Course

1. Get move your profession as Big information has purchased in IT world 2. Get a handle on the ideas of HDFS and Map Reduce 3. Turned out to be capable in most recent adaptation of Apache Hadoop 4. Create complex Game-Changing MapReduce Application 5. Information investigation utilizing Pig and Hive 6. Play with NoSQL database – Apache HBase 7. Secure comprehension of ZooKeeper administration 8. Information stacking utilizing Apache Sqoop and Flume 9. Uphold best practices for Hadoop advancement and sending 10. Ace treatment of substantial informational collection utilizing Hadoop biological community 11. Take a shot at live venture on Big Data investigation to get hands-on Experience 12. Appreciate other Big Data innovations like Apache Spark

Who Should Take Hadoop Course

This course is extensively suited for applicants of all spaces who are quick to seek after huge information as a profession. The consideration of Java module has made it much additionally engaging for non-specialized competitors too.

Notwithstanding, according to my understanding, earlier information of java in this course ought to be a noteworthy preferred standpoint. The extra java module can be utilized as a refresher (if required). Competitors from IT foundation would discover this course less demanding to relate and get it. Then again, a beginner with some constancy and enough practice ought to have the capacity to recognize the wordings utilized as a part of various phases of this course.

Programming Developers and Architects

Investigation Professionals Senior IT experts Testing and Mainframe experts Information Management Professionals Business Intelligence Professionals Extend Managers Trying Data Scientists Graduates hoping to assemble a profession in Big Data Analytics

Read More: 100 placement guarantee courses in bangalore

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Welcome to Sgraph Infotech

Sgraph Infotech is a main MSBI Training Institute in Banglore. We convey an unlimited cluster of instructive and instructional classes with a wide assortment of coaches in all areas. We are pleased to have helped a great many understudies to learn new IT abilities and increase compensating new vocations. Our solid group of profession designers are accessible to give constant and arrangement situated MSBI Training Courses in Marathalli, Bangalore.

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