Practice - Module Summary
Practice Questions
Test your understanding with targeted questions
What does the COUNT function do?
💡 Hint: Think about how you would tally items in a collection.
What will SELECT SUM(salary) FROM Employees; return?
💡 Hint: Consider what salary represents in your context.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does the GROUP BY clause do?
💡 Hint: Remember how you group related data together.
True or False: The HAVING clause can be used to filter records before aggregation takes place.
💡 Hint: Think about the order of operations in SQL queries.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Create a query that retrieves all departments with more than 100 students and shows each department’s average grade.
💡 Hint: Remember to structure your JOIN and GROUP BY clause correctly.
Run a query to find employees who earn more than any intern in the organization.
💡 Hint: Focus on how the correlation between your subquery and main query plays out.
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Reference links
Supplementary resources to enhance your learning experience.