PostgreSQL Subquery: Get nth maximum of salaries
21. Write a query to get nth max salaries of employees.
Sample Solution:
Code:
SELECT *
FROM employees emp1
WHERE (1) = (
SELECT COUNT(DISTINCT(emp2.salary))
FROM employees emp2
WHERE emp2.salary > emp1.salary);
Sample table: employees
Output:
pg_exercises=# SELECT * pg_exercises-# FROM employees emp1 pg_exercises-# WHERE (1) = ( pg_exercises(# SELECT COUNT(DISTINCT(emp2.salary)) pg_exercises(# FROM employees emp2 pg_exercises(# WHERE emp2.salary > emp1.salary); employee_id | first_name | last_name | email | phone_number | hire_date | job_id | salary | commission_pct | manager_id | department_id -------------+------------+-----------+---------------+--------------+------------+--------+----------+----------------+------------+--------------- 101 | Neena | Kochhar | not available | 515.123.4568 | 1987-06-18 | AD_VP | 17000.00 | 0.00 | 100 | 90 102 | Lex | De Haan | not available | 515.123.4569 | 1987-06-19 | AD_VP | 17000.00 | 0.00 | 100 | 90 (2 rows)
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