SQL Exercise: Employees who earn a commission and maximum salary

Last update on October 10 2025 12:33:48 (UTC/GMT +8 hours)

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54. From the following table, write a SQL query to find those employees who earn a commission and receive maximum salary. Return complete information about the employees.

Sample table: employees

Sample Solution:

SELECT *
FROM employees
WHERE salary =
    (SELECT max(salary)
     FROM employees
     WHERE commission IS NOT NULL);

Sample Output:

 emp_id | emp_name | job_name | manager_id | hire_date  | salary  | commission | dep_id
--------+----------+----------+------------+------------+---------+------------+--------
  64989 | ADELYN   | SALESMAN |      66928 | 1991-02-20 | 1700.00 |     400.00 |   3001
(1 row)

Explanation:

The said query in SQL that selects all columns from the 'employees' table where the salary is equal to the maximum salary of employees who have a non-NULL commission value.

The subquery inside the WHERE clause finds the maximum salary among the employees who have a commission value that is not NULL. If there are no such employees, the subquery returns NULL, and the outer query will not return any rows.

Go to:

PREV : Employees salary exceed department average, ASC order.
NEXT : List employees not in the department 1001 but in 3001.

Practice Online

Structure of employee Database:

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