PostgreSQL Subquery: Get three maximum salaries

19. Write a query to get three maximum salaries.

Sample Solution:

Code:

SELECT DISTINCT salary 
FROM employees a 
WHERE  3 >= (SELECT COUNT(DISTINCT salary) 
FROM employees b 
WHERE a.salary <= b.salary) 
ORDER BY a.salary DESC;

Sample table: employees

Output:

pg_exercises=# SELECT DISTINCT salary
pg_exercises-# FROM employees a
pg_exercises-# WHERE  3 >= (SELECT COUNT(DISTINCT salary)
pg_exercises(# FROM employees b
pg_exercises(# WHERE a.salary <= b.salary)
pg_exercises-# ORDER BY a.salary DESC;
  salary
----------
 24000.00
 17000.00
 14000.00
(3 rows)

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