GATE CS 2021 Set 2 — Question 41

MCQ+2 / -0.67EasyGrouping & OrderingSQLDatabasesAggregate FunctionsSubqueries

Databases → SQL → Aggregate Functions

Last updated 5 September 2026

Question

The relation scheme given below is used to store information about the employees of a company, where empId is the key and deptId indicates the department to which the employee is assigned. Each employee is assigned to exactly one department. emp(empId, name, gender, salary, deptId) Consider the following SQL query: select deptId, count(*) from emp where gender = "female" and salary > (select avg(salary) from emp) group by deptId; The above query gives, for each department in the company, the number of female employees whose salary is greater than the average salary of

Correct answer (B) employees in the company. Solution The subquery (select avg(salary) from emp) is an uncorrelated subquery that calculates the average salary of all employees in the entire company. The outer query then filters for employees who are female and have a salary greater than this company-wide average. Finally, the group by deptId clause counts these specific female employees for each department. Therefore, the query counts female employees in each department whose salary is greater than the average salary of all employees in the company. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (B) employees in the company. Solution The subquery (select avg(salary) from emp) is an uncorrelated subquery that calculates the average salary of all employees in the entire company. The outer query then filters for employees who are female and have a salary greater than this company-wide average. Finally, the group by deptId clause counts these specific female employees for each department. Therefore, the query counts female employees in each department whose salary is greater than the average salary of all employees in the company.

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