Web Reference: Understand how to use subqueries (nested queries) in SQL to solve complex data retrieval problems and filter data effectively. Feb 23, 2026 · Welcome to the SQL Quiz! This blog post features 25 multiple-choice questions that explore Subqueries concept of SQL. 1. What is a subquery in SQL? 2. Which of the following is true about sub-queries? d) They execute before the main query executes. The sub-query always executes before the execution of the main query. Subqueries are completed first. Practice queries on Select, Where, Limit, Order by, Aggregates, Group by, Joins, Sub-queries and Case expressions. Solve over 80 SQL exercises using real life case studies.
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