SQL SUM() function

SUM() function

The SQL AGGREGATE SUM() function returns the SUM of all selected column.

Syntax:

SUM ([ALL | DISTINCT] expression )

DBMS Support : SUM() function

DB2 and Oracle Syntax :

 SUM ([ALL | DISTINCT] expression ) OVER (window_clause)

Parameters:

Syntax diagram - SUM() function

SQL SUM() on specific column example

To get the total SUM of 'advance_amount' of the 'orders' table, the following SQL statement can be used :

Sample table: orders

SQL Code:

SELECT SUM(advance_amount) 
FROM orders;

Relational Algebra Expression:

Relational Algebra Tree:

Output:

SUM(ADVANCE_AMOUNT)
-------------------
              19450

Pictorial Presentation:

SQL SUM() using multiple columns example

To get the sum of 'opening_amt' and 'receive_amt' from the 'customer' table, the following SQL statement can be used:

Sample table: customer

SQL Code:

SELECT SUM (opening_amt + receive_amt) 
FROM customer;

Relational Algebra Expression:

Relational Algebra Tree:

Output:

SUM(OPENING_AMT+RECEIVE_AMT)
----------------------------
                      353000

SQL SUM() with where

In the following example, we have discussed usage of WHERE clause along with the SQL SUM() function to sum one or more columns against one or more conditions.

Example:

To get the total SUM of 'advance_amount' of the 'orders' table with the following condition -

1. 'agent_code' must be 'A003',

the following SQL statement can be used :

Sample table: orders

SQL Code:

SELECT SUM (advance_amount) 
FROM orders 
WHERE agent_code = 'A003';

Relational Algebra Expression:

Relational Algebra Tree:

Output:

SUM(ADVANCE_AMOUNT)
-------------------
               1000

SQL SUM() with COUNT()

In the following example, we have discussed the usage of SQL SUM() and SQL COUNT() together in a SQL SELECT statement. Regarding this, it should be mentioned that the SQL SUM() and SQL COUNT() both returns a single row.

Example:

To get data of 'cust_country',SUM of 'opening_amt' for each 'cust_country' and number of 'cust_country' from the 'customer' table with the following condition -

1. data should be a group on 'cust_country',

the following SQL statement can be used :

Sample table: customer

SQL Code:

SELECT cust_country, SUM(opening_amt), 
COUNT(cust_country) 
FROM customer 
GROUP BY cust_country;

Relational Algebra Expression:

Relational Algebra Tree:

Output:

CUST_COUNTRY         SUM(OPENING_AMT) COUNT(CUST_COUNTRY)
-------------------- ---------------- -------------------
USA                             18000                   4
India                           73000                  10
Australia                       19000                   3
Canada                          25000                   3
UK                              26000                   5

Note: Outputs of the said SQL statement shown here is taken by using Oracle Database 10g Express Edition

Here is a slide presentation of all aggregate functions.

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