PostgreSQL Aggregate Functions and Group By: Get the difference between the highest and lowest salaries

8. Write a query to get the difference between the highest and lowest salaries.

Sample Solution:

Code:

SELECT MAX(salary) - MIN(salary) DIFFERENCE
FROM employees;

Sample table: employees

Output:

pg_exercises=# SELECT MAX(salary) - MIN(salary) DIFFERENCE
pg_exercises-# FROM employees;
 difference
------------
   21900.00
(1 row)

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