PostgreSQL Aggregate Functions and Group By: Find the minimum salary paid to the employee

3. Write a query to get the minimum salary from employees table.

Sample Solution:

Code:

-- Retrieve the minimum salary among all employees
SELECT MIN(salary) 
FROM employees;

Explanation:

• This SQL query is designed to retrieve the minimum (lowest) salary among all employees stored in the database.
• The MIN() function is an aggregate function in SQL that calculates the minimum value in a column.
• salary is presumably a column in the employees table that holds the salary information for each employee.
• The query calculates the minimum value in the salary column for all rows in the employees table.
• The result will be a single value representing the lowest salary among all employees.

Sample table: employees

Output:

pg_exercises=# SELECT MIN(salary)
pg_exercises-# FROM employees;
   min
---------
 2100.00
(1 row)

Relational Algebra Expression:

Relational Algebra Tree:

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