PostgreSQL MIN function

MIN function

The MIN function determines the smallest of all selected values of a column.

Syntax:

MIN (* | [DISTINCT] ALL | column_name)

Parameters

PostgreSQL MIN function example

The sample table

If we want to find the minimum salary from all employees in the employee table, the following SQL can be used.

SQL Code:

SELECT MIN(salary) 
FROM employee;

Output:

Visual Presentation of PostgreSQL MIN()

PostgreSQL MIN as a level

If we want to get the minimum salary for all employees and show the result against 'Minimum Salary' head in the employee table, the following SQL can be used.

SQL Code:

SELECT MIN(salary) "Minimum Salary" 
FROM employee;

OR

SQL Code:

SELECT MIN(DISTINCT salary) "Minimum Salary" 
FROM employee;

OR

SQL Code:

SELECT MIN(ALL salary) "Minimum Salary" 
FROM employee;

Output:

PostgreSQL MIN function two columns

If we want to get the minimum salary and deduction from employee table, the following SQL can be used.

SQL Code:

SELECT MIN(salary) "Minimum Salary" ,
MIN(deduction) "Minimum Deduction"
FROM employee;

Output:

PostgreSQL MIN with MAX, COUNT, and SUM

If we want to get the minimum salary and deduction from employee table, the following SQL can be used.

SQL Code:

SELECT MIN(salary) "Minimum Salary" ,
MAX(salary) "Maximum Salary",
COUNT(*) "Total Employee",
SUM(salary) "Total Salary"
FROM employee;

Output:

PostgreSQL MIN WHERE clause

If we want to get the minimum salary and deduction from employee table who belongs to the designation 'SALESMAN', the following SQL can be used.

SQL Code:

SELECT MIN(salary) "Minimum Salary" ,
MIN(deduction) "Minimum Deduction"
FROM employee
WHERE designame='SALESMAN';

Output:

PostgreSQL MIN with GROUP BY

Sample table: employees

If we want to get the minimum salary for each designation available in employees table, the following SQL can be used.

SQL Code:

SELECT job_id, MIN(salary) AS "Minimum Salary" 
FROM employees 
GROUP BY job_id;

Output:

   job_id   | Minimum Salary
------------+---------------
 AC_ACCOUNT |        8300.00
 ST_MAN     |        5800.00
 IT_PROG    |        4200.00
 SA_MAN     |       10500.00
 AD_PRES    |       24000.00
 AC_MGR     |       12000.00
 FI_MGR     |       12000.00
 AD_ASST    |        4400.00
 MK_MAN     |       13000.00
 PU_CLERK   |        2500.00
 HR_REP     |        6500.00
 PR_REP     |       10000.00
 FI_ACCOUNT |        6900.00
 SH_CLERK   |        2500.00
 AD_VP      |       17000.00
 SA_REP     |        6100.00
 ST_CLERK   |        2100.00
 MK_REP     |        6000.00
 PU_MAN     |       11000.00
(19 rows)

Visual Presentation of PostgreSQL MIN with GROUP BY

PostgreSQL MIN with HAVING CLAUSE

Sample table: employees

If we want to get those designations, whose minimum salary is 6500 and above within the salary range below 12000, the following SQL can be used.

SQL Code:

SELECT job_id,MIN(salary) AS "Minimum Salary" 
FROM employees 
WHERE salary<12000 
GROUP BY job_id 
HAVING MIN(salary)>=6500;

Output:

   job_id   | Minimum Salary
------------+----------------
 AC_ACCOUNT |        8300.00
 SA_MAN     |       10500.00
 HR_REP     |        6500.00
 PR_REP     |       10000.00
 FI_ACCOUNT |        6900.00
 PU_MAN     |       11000.00
(6 rows)

Visual Presentation of PostgreSQL MIN with HAVING

PostgreSQL MIN with GROUP BY and ORDER BY

Sample table: employees

The following query will return the designation which minimum salary is 6500 and above within the salary range below 12000 and the minimum salary for each designation comes in the list in descending order.

SQL Code:

SELECT job_id,MIN(salary) AS "Minimum Salary" 
FROM employees 
WHERE salary<12000
GROUP BY job_id 
HAVING MIN(salary)>=6500
ORDER BY MIN(salary) DESC;

Output:

   job_id   | Minimum Salary
------------+----------------
 PU_MAN     |       11000.00
 SA_MAN     |       10500.00
 PR_REP     |       10000.00
 AC_ACCOUNT |        8300.00
 FI_ACCOUNT |        6900.00
 HR_REP     |        6500.00
(6 rows)

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