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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a subquery?
💡 Hint: Think about a query inside a query.
Question 2
Easy
What does a CTE stand for?
💡 Hint: It starts with 'C' and is related to organizing results.
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 is a subquery?
- A standalone query
- A query within another query
- A type of join
💡 Hint: Remember, it's like asking a question inside another question.
Question 2
True or false: CTEs only allow for storing data temporarily.
- True
- False
💡 Hint: Think about what a temporary table does.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create an SQL query that uses both a subquery and a CTE to find all employees in departments with total sales above 100,000.
💡 Hint: Break this down—start with the CTE to aggregate sales.
Question 2
Write a complex SQL query using window functions to rank employees by their salaries and show their names along with average salaries in their departments.
💡 Hint: Use window functions for both ranking and averaging.
Challenge and get performance evaluation