Practice - Aggregate Functions
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Practice Questions
Test your understanding with targeted questions
What function would you use to count the number of active users?
💡 Hint: It's the function that counts rows.
What does SUM() do in SQL?
💡 Hint: Think of it as finding the total sales.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does COUNT() do in SQL?
💡 Hint: Consider what it means to count rows.
True or False: SUM() can only be used on text columns.
💡 Hint: Remember what kind of data you can sum up.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Write a SQL query that uses both SUM() and AVG() to display the total sales and the average order value from a sales table.
💡 Hint: Use both functions in the SELECT statement.
Explain how you would use COUNT() with a GROUP BY clause to determine how many employees work in each department.
💡 Hint: Consider how you group data and then count it.
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