PostgreSQL Aggregate Functions and Group By: Find the maximum salary paid to the employee working as a Programmer

4. Write a query to get the maximum salary of an employee working as a Programmer.

Sample Solution:

Code:

SELECT MAX(salary) 
FROM employees 
WHERE job_id = 'IT_PROG';

Sample table: employees

Output:

pg_exercises=# SELECT MAX(salary)
pg_exercises-# FROM employees
pg_exercises-# WHERE job_id = 'IT_PROG';
   max
---------
 9000.00
(1 row)

Relational Algebra Expression:

Relational Algebra Tree:

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