SUM

Description

Aggregate function.

The SUM() function calculates the sum of a set of values.

note

NULL values are not counted.

Syntax

> SUM(expr)

Arguments

Arguments	Description
expr	Any expression

Returned Value

Returns the sum of expr. A double if the input type is double, otherwise integer.

If there are no matching rows, SUM() returns NULL.

Examples

• Example 1:

> drop table if exists tbl1,tbl2;
> create table tbl1 (col_1a tinyint, col_1b smallint, col_1c int, col_1d bigint, col_1e char(10) not null);
> insert into tbl1 values (0,1,1,7,"a");
> insert into tbl1 values (0,1,2,8,"b");
> insert into tbl1 values (0,1,3,9,"c");
> insert into tbl1 values (0,1,4,10,"D");
> insert into tbl1 values (0,1,5,11,"a");
> insert into tbl1 values (0,1,6,12,"c");

> select sum(col_1c) from tbl1;
+-------------+
| sum(col_1c) |
+-------------+
|          21 |
+-------------+

> select sum(col_1d) as c1 from tbl1 where col_1d < 13 group by col_1e order by c1;
+------+
| c1   |
+------+
|    8 |
|   10 |
|   18 |
|   21 |
+------+

• Example 2:

> CREATE TABLE t1(a varchar(255), b INT, c INT UNSIGNED, d DECIMAL(12,2), e REAL);
> INSERT INTO t1 VALUES('iynfj', 1, 1, 1, 1);
> INSERT INTO t1 VALUES('innfj', 2, 2, 2, 2);
> SELECT SUM( DISTINCT b ) FROM t1 GROUP BY b;
+-----------------+
| sum(distinct b) |
+-----------------+
|               1 |
|               2 |
+-----------------+