Practice - Scalar Subqueries
Practice Questions
Test your understanding with targeted questions
What does a scalar subquery return?
💡 Hint: Think about what 'scalar' means in mathematics.
Can you use a scalar subquery in a WHERE clause?
💡 Hint: Consider comparing values in a SQL query.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a scalar subquery return?
💡 Hint: Think about the meaning of 'scalar'.
True or False: Scalar subqueries can only be used in the SELECT clause.
💡 Hint: Consider all possible places in a SQL query.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Write a SQL query that finds all employees who earn more than twice the average salary?
💡 Hint: Think about how can you manipulate the AVG function.
Given a table of products with prices, write a query that selects the products cheaper than the average price of all products in the same category.
💡 Hint: Consider that you need to reference the outer query's category.
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Reference links
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