Practice - Subqueries (Nested Queries)
Practice Questions
Test your understanding with targeted questions
What is a subquery?
💡 Hint: Think about what a query inside another query does.
True or False: A scalar subquery can return more than one value.
💡 Hint: Consider what 'scalar' means.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does a subquery do?
💡 Hint: Think about querying information step by step.
Which operator is used to check if a value matches any value from a subquery?
💡 Hint: This operator allows for matching against multiple potential values.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
Write a query to find students who have at least one enrolled course where the average grade is above the class average.
💡 Hint: Think of how to layer your queries to get average grades from multiple tables.
Create a SQL statement using a subquery to list departments where the total salary of employees exceeds a specified amount.
💡 Hint: Combine GROUP BY and HAVING effectively in your statement.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.