SQL
Top SQL Interview Questions for Data Analysts
Prepare for data analyst interviews with top SQL interview questions, detailed answers, and real examples covering joins, queries, aggregations, and problem-solving skills.
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SQL Tutorials: Queries, Joins and Normalisation (2026)
Joins, window functions, indexing and normalisation, explained with the query patterns that keep coming up in analyst interviews.
17 articles
SQL
Top 15 SQL Project Ideas for Aspiring Data Analysts
Explore the best SQL project ideas for aspiring data analysts. Learn project topics, tools, skills, salary ranges, job roles, career growth and a 30-day roadmap to build a strong analytics portfolio.
SQL
SQL Project for Sales Data Aggregation & Insights: Career Guide for Students
Learn SQL project techniques for sales data aggregation and insights. Explore career opportunities, skills required, salary expectations, and future growth in data analytics.
SQL
25 SQL Queries That Will Get You Hired in 2026
Learn 25 SQL queries that will get you hired in 2026. From basic selects to joins, aggregates, and window functions, master SQL for data analyst and developer roles.
SQL
How to Prepare for the HackerRank SQL Certification
Get ready for the HackerRank SQL Certification with this comprehensive guide. Learn key topics, practice tips, and strategies to ace the exam and boost your career.
SQL
What is normalization in SQL and why is it important?
Learn about SQL normalization, its importance, and how it reduces redundancy and improves data integrity. Understand the different normal forms and their benefits in organizing databases effectively.
SQL
How would you write a query to find duplicates in a table?
Learn how to write an SQL query to find and remove duplicates from a table. This guide covers the use of GROUP BY, HAVING, and ROW_NUMBER to keep your database clean and efficient.
SQL
What is the difference between ‘INNER JOIN’ and ‘LEFT JOIN’ in SQL?
Learn the difference between INNER JOIN and LEFT JOIN in SQL, with practical examples. Understand when to use each join to get the right data in your queries.
SQL
What are subqueries and how do you use them in SQL?
Learn how to use subqueries in SQL with this comprehensive guide. Understand the types, applications, and performance considerations to write efficient SQL queries.
SQL
How does SQL handle NULL values?
Learn how SQL handles NULL values, and discover essential techniques for working with NULLs in your queries. Master NULL handling in SQL with practical examples.
SQL
What is the difference between ‘WHERE’ and ‘HAVING’ clauses in SQL?
Learn the difference between the ‘WHERE’ and ‘HAVING’ clauses in SQL. Discover how to use these clauses effectively in your queries and master SQL filtering.
SQL
Beginner to Pro: Learning SQL for Business Decision-Making
Master SQL for business decision-making with this comprehensive guide. Learn SQL from the ground up to unlock valuable insights and improve business strategies.
