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SQL: MIN Function

Learn how to use the SQL MIN function with syntax and examples.

Description

The SQL MIN function is used to return the minimum value of an expression in a SELECT statement.

Syntax

The syntax for the SQL MIN function is:

SELECT MIN(expression)
FROM tables
WHERE conditions;

Parameters or Arguments

expression can be a numeric field or formula.

Example - With Single expression

The simplest way to use the SQL MIN function would be to return a single field that calculates the MIN value.

For example, you might wish to know the minimum salary of all employees.

SELECT MIN(salary) AS "Lowest salary"
FROM employees;

In this SQL MIN function example, we've aliased the MIN(salary) field as "Lowest salary". As a result, "Lowest salary" will display as the field name when the result set is returned.

Example - Using SQL GROUP BY

In some cases, you will be required to use the SQL GROUP BY clause with the SQL MIN function.

For example, you could also use the SQL MIN function to return the name of each department and the minimum salary in the department.

SELECT department, MIN(salary) AS "Lowest salary"
FROM employees
GROUP BY department;

Because you have listed one column in your SQL SELECT statement that is not encapsulated in the SQL MIN function, you must use the SQL GROUP BY clause. The department field must, therefore, be listed in the GROUP BY section.