SQL Quest › SQL Interview Questions › Subqueries & CTEs
Your First CTE (WITH Clause)
A CTE (Common Table Expression) lets you name a subquery and reuse it. Write a CTE called dept_stats that calculates each department's headcount and avg_salary (rounded). Then from dept_stats, show all departments sorted by avg_salary descending. CTEs make complex queries readable by breaking them into named steps.
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Schema
employees
| emp_id | name | department | position | salary | hire_date | manager_id | performance_rating |
|---|---|---|---|---|---|---|---|
| 1 | Alice Johnson | Engineering | Senior Developer | 95000 | 2019-03-15 | 5 | 4.5 |
| 2 | Bob Smith | Engineering | Developer | 75000 | 2020-06-01 | 1 | 3.8 |
| 3 | Carol Williams | Marketing | Marketing Manager | 85000 | 2018-09-20 | NULL | 4.2 |
Expected output: Engineering | 10 | 85000
Hint
SELECT, CTE, Aggregation, and open the hint there if you stall.Concepts
SELECT CTE Aggregation GROUP BY
Practise the topic: SQL practice questions · CTE practice · GROUP BY exercises
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