- PostgreSQL - Home
- PostgreSQL - Overview
- PostgreSQL - Environment Setup
- PostgreSQL - Syntax
- PostgreSQL - Data Types
- PostgreSQL - Operators
- PostgreSQL - Expressions
- PostgreSQL Database
- PostgreSQL - Create Database
- PostgreSQL - ALTER DATABASE
- PostgreSQL - Drop Database
- PostgreSQL - Loading Database
- PostgreSQL - Rename Database
- PostgreSQL - Select Database
- PostgreSQL - Show Database
- PostgreSQL Query Operations
- PostgreSQL - SELECT
- PostgreSQL - CREATE
- PostgreSQL - INSERT
- PostgreSQL - UPDATE
- PostgreSQL - DELETE
- PostgreSQL - ALTER TABLE Command
- PostgreSQL - WHERE Clause
- PostgreSQL - ORDER BY Clause
- PostgreSQL - GROUP BY
- PostgreSQL - HAVING Clause
- PostgreSQL - DISTINCT Keyword
- PostgreSQL - LIMIT Clause
- PostgreSQL - LIKE Clause
- PostgreSQL - WITH Clause
- PostgreSQL - AND & OR Clauses
- PostgreSQL - DROP TABLE
- PostgreSQL - Upsert
- TRUNCATE TABLE Command
- PostgreSQL JOINS & Schemas
- PostgreSQL Schemas
- PostgreSQL Joins
- PostgreSQL Data Integrity & Transaction
- PostgreSQL - Constraints
- PostgreSQL - Transactions
- PostgreSQL - Commit
- PostgreSQL - Rollback
- PostgreSQL - Views
- PostgreSQL Functions
- PostgreSQL - ALIAS Syntax
- PostgreSQL - Functions
- PostgreSQL - Useful Function
- PostgreSQL - MAX() Function
- PostgreSQL - MIN() Function
- PostgreSQL - SUM() Function
- PostgreSQL - COUNT() Function
- PostgreSQL - Array Function
- PostgreSQL - String Function
- PostgreSQL - Numeric Function
- PostgreSQL Operators
- PostgreSQL - UNION Operator
- PostgreSQL - EXCEPT Operator
- PostgreSQL - ANY Operator
- PostgreSQL - ALL Operator
- PostgreSQL - EXISTS Operator
- PostgreSQL Interface
- PostgreSQL - C / C++
- PostgreSQL - Java
- PostgreSQL - PHP
- PostgreSQL - Perl
- PostgreSQL - Python
- Advanced PostgreSQL
- PostgreSQL - NULL Values
- PostgreSQL - Triggers
- PostgreSQL - Indexes
- PostgreSQL - Locks
- PostgreSQL - Sub Queries
- PostgreSQL - Auto Increment
- PostgreSQL - Privileges
- PostgreSQL - Date/Time Functions & Operators
- PostgreSQL - Errors & Messages
- PostgreSQL - Assert
- PostgreSQL - Quick Guide
- PostgreSQL - Cheatsheet
- PostgreSQL - Useful Resources
- PostgreSQL - Discussion
Selected Reading
PostgreSQL - SUM Function
PostgreSQL SUM function is used to find out the sum of a field in various records.
To understand the SUM function consider the table COMPANY having records as follows −
testdb# select * from COMPANY; id | name | age | address | salary ----+-------+-----+-----------+-------- 1 | Paul | 32 | California| 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 6 | Kim | 22 | South-Hall| 45000 7 | James | 24 | Houston | 10000 (7 rows)
Now, based on the above table, suppose you want to calculate the total of all the salary, then you can do so by using the following command −
testdb# SELECT SUM(salary) FROM company;
The above given PostgreSQL statement will produce the following result −
sum -------- 260000 (1 row)
You can take the sum of various records set using the GROUP BY clause. The following example will sum up all the records related to a single person and you will have salary for each person.
testdb# SELECT name, SUM(salary) FROM company GROUP BY name;
The above given PostgreSQL statement will produce the following result −
name | sum -------+------- Teddy | 20000 Paul | 20000 Mark | 65000 David | 85000 Allen | 15000 Kim | 45000 James | 10000 (7 rows)
postgresql_useful_functions.htm
Advertisements