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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What SQL function would you use to count the number of users?
💡 Hint: Think of how we track the number of entries in a dataset.
Question 2
Easy
How would you aggregate the total sales from a table?
💡 Hint: Consider what you're adding up.
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 the AVG function calculate?
- Total of values
- Lowest value
- Average of values
💡 Hint: Think about how you would find the average score.
Question 2
True or False: The COUNT function can return 0 if no rows meet the condition.
- True
- False
💡 Hint: Consider what happens when there are no results.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Write a complex SQL query that retrieves departments with an average salary above the total average salary and shows the maximum salary within each department.
💡 Hint: You'll need to use subqueries to compare average salaries.
Question 2
Using a sales data table, create a query to find products whose total sales exceed the average sales of all products and list them.
💡 Hint: Think about how you would aggregate and compare the totals.
Challenge and get performance evaluation