Oracle/SQL MIN Function

SQL MIN FunctionSQL MIN function returns least or minimum value out of available records/values. Oracle MIN Function is opposite of the SQL MAX Function.

SQL MIN Function Syntax

SELECT MIN(expression)
FROM table_name
WHERE conditions;

SQL MIN Function Examples

Let’s take an example for understanding the Oracle MIN Function

Suppose we have a table named “Employee” with the data as shown below.

Employee_ID Employee_Name Salary Department Commission
101 Emp A 10000 Sales 10
102 Emp B 20000 IT 20
103 Emp C 28000 IT 20
104 Emp D 30000 Support
105 Emp E 32000 Sales 10

Now we will see what the SQL MIN Function does when used in different scenarios

SQL MIN Function – Simple Usage

The simplest way to use SQL MIN Function is to fetch the minimum value from a column of a table

For example, with the below Oracle MIN Function query we will be able to fetch the minimum value of commission.

SELECT MIN(commission) as "MIN Commission"
FROM employee;

The above MIN SQL Function query will return result as “10” as that’s the lowest commission available in the “Employee” table.

Also note that we have aliased the MIN(commission) field as “MIN Commission”, hence once the query is run “MIN Commission”  will be displayed as the field name of the result from the Oracle MIN Function query.

NULL values are not considered by the MIN SQL Function.

SQL MIN Function – SQL WHERE Clause Example

SQL MIN Function can be used in SQL SELECT Statement having SQL WHERE Clause.

For example, below SQL MIN query returns minimum salary in ‘Sales’ department.

SELECT MIN(salary) as "Minimum Salary"
FROM employee
WHERE department  = 'Sales';

The above Oracle MIN Function query returns ‘10000’ as minimum salary in ‘Sales’ department.

Also note that we have aliased the MIN(salary) field as “Minimum Salary”.

SQL MIN Function – SQL GROUP BY Clause Example

SQL MIN Function can be used in SQL SELECT Statement having SQL GROUP BY Clause.

For example, Oracle MIN Function query below, shows department name and minimum salary of each department.

SELECT department "Department Name"
,MIN(salary) "Minimum Salary"
FROM employee
GROUP BY department;

The data returned by above MIN SQL Function query will be:

Departement Name Minimum Salary
Sales 10000
IT 20000
Support 30000

Here notice that by using Oracle MIN Function with SQL GROUP BY Clause we have retrieved minimum salaries of every unique department along with the department name.

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