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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What function would you use to count the number of active users?
💡 Hint: It's the function that counts rows.
Question 2
Easy
What does SUM() do in SQL?
💡 Hint: Think of it as finding the total sales.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does COUNT() do in SQL?
- Counts the number of distinct values
- Counts the total number of rows
- Calculates the average
💡 Hint: Consider what it means to count rows.
Question 2
True or False: SUM() can only be used on text columns.
- True
- False
💡 Hint: Remember what kind of data you can sum up.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
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.
Question 2
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.
Challenge and get performance evaluation