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walmart interview questions and answers

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7 Epic Platforms to Level Up Your SQL Game!!!!

If you're looking to level up your SQL skills, you're in the right place. SQL is a fundamental language for data professionals, and mastering it can open up opportunities in data science, data analysis, and other data-related roles.

But how do you go from learning SQL to becoming proficient in it?

The answer is simple: practice, practice, practice.

In this article, we'll explore the 7 best platforms to practice SQL and sharpen your data skills.

1. HackerRank: Coding Challenges for SQL Enthusiasts

HackerRank is a leading platform for coding challenges, and it offers a comprehensive SQL practice suite. Whether you're a beginner or an experienced SQL user, HackerRank has a wide range of questions to suit your skill level. You can filter the questions by difficulty (easy, medium, or hard) or by topic (select queries, joins, aggregations, etc.). Additionally, HackerRank offers Skills Certification Tests that allow you to test your SQL skills in a timed assessment format. With a free account, you can access the entire collection of practice questions and assessments.

2. SQLPad: Practice SQL with Real-World Scenarios

SQLPad is another excellent platform for practicing SQL. It provides practice questions in three broad areas: single-table operations, multi-table operations, and window functions. Each category includes questions of varying difficulty levels, allowing you to gradually progress from basic concepts to more advanced topics. SQLPad also offers industry-specific SQL coding questions, which can help you prepare for real-world scenarios. While some features require a paid account, you can access a selection of questions with a free account.

3. StrataScratch: Learn SQL with Real Company Interview Questions

StrataScratch is a popular platform that offers a vast collection of SQL interview questions. What sets StrataScratch apart is its focus on real company interview questions. You can filter the questions by topics, difficulty levels, and even specific companies. This platform provides a coding workspace that supports PostgreSQL, MySQL, and Microsoft SQL Server. If you're comfortable with Python, you can use the pandas library to solve the questions. With a free account, you can access a substantial number of questions and solutions.

4. DataLemur: Master SQL with Curated Interview Questions

DataLemur is a platform that specializes in curated SQL interview questions. Its collection includes questions that have appeared in interviews at top tech companies like LinkedIn, Tesla, Microsoft, and Walmart. With over 40 interview questions, DataLemur covers various SQL topics, including conditional aggregation, string and window functions, and cumulative sums. This platform can help you familiarize yourself with the types of questions commonly asked in SQL interviews.

5. LeetCode: Sharpen Your SQL Skills with Coding Challenges

LeetCode, a popular platform for coding challenges, also offers a diverse collection of SQL questions. You can find SQL problems of different difficulty levels and topics on LeetCode. The platform allows you to filter the questions by company tags, so you can practice questions asked by specific companies like Google, Amazon, Facebook, and more. While some features require a premium account, you can access a subset of the questions with a free account.

6. Mode: Learn and Practice SQL in a Structured Curriculum

Mode is a comprehensive platform that offers a structured curriculum for learning and practicing SQL. Its SQL tutorial covers three levels: basic, intermediate, and advanced. Each level includes multiple lessons with practice questions. Mode's curriculum covers a wide range of SQL topics, including select statements, joins, aggregate functions, subqueries, and window functions. This platform is an excellent choice if you prefer a guided learning experience with a well-organized curriculum.

7. SQLZoo: Learn SQL with Interactive Lessons and Assessments

SQLZoo is a learning and practice platform for SQL that offers interactive lessons and assessments. Its bite-sized lessons cover various SQL topics, starting from basic select statements to more advanced concepts like window functions. Each lesson includes short practice exercises to reinforce your learning. SQLZoo also provides dedicated assessments with more involved SQL questions to test your skills. This platform is ideal for hands-on learners who prefer interactive learning experiences.

Get Started with Tutort Academy Data Science Courses With Tutort Academy's data science courses, you can learn SQL and other essential data skills from industry experts and gain the confidence to excel in your data career.

Conclusion

Practicing SQL is crucial for improving your data skills and acing SQL interviews. The 7 platforms mentioned in this article offer a variety of practice questions and coding challenges to help you sharpen your SQL skills. From HackerRank's coding challenges to SQLPad's real-world scenarios and Tutort Academy's comprehensive data science courses, you have plenty of options to choose from. So, start practicing SQL today and take your data skills to the next level!