SUM

Description

Aggregate function.

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

note

NULL values are not counted.

Syntax

  1. > SUM(expr)

Arguments

ArgumentsDescription
exprAny 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:
  1. > drop table if exists tbl1,tbl2;
  2. > create table tbl1 (col_1a tinyint, col_1b smallint, col_1c int, col_1d bigint, col_1e char(10) not null);
  3. > insert into tbl1 values (0,1,1,7,"a");
  4. > insert into tbl1 values (0,1,2,8,"b");
  5. > insert into tbl1 values (0,1,3,9,"c");
  6. > insert into tbl1 values (0,1,4,10,"D");
  7. > insert into tbl1 values (0,1,5,11,"a");
  8. > insert into tbl1 values (0,1,6,12,"c");
  10. > select sum(col_1c) from tbl1;
  11. +-------------+
  12. | sum(col_1c) |
  13. +-------------+
  14. |          21 |
  15. +-------------+
  17. > select sum(col_1d) as c1 from tbl1 where col_1d < 13 group by col_1e order by c1;
  18. +------+
  19. | c1   |
  20. +------+
  21. |    8 |
  22. |   10 |
  23. |   18 |
  24. |   21 |
  25. +------+
  • Example 2:
  1. > CREATE TABLE t1(a varchar(255), b INT, c INT UNSIGNED, d DECIMAL(12,2), e REAL);
  2. > INSERT INTO t1 VALUES('iynfj', 1, 1, 1, 1);
  3. > INSERT INTO t1 VALUES('innfj', 2, 2, 2, 2);
  4. > SELECT SUM( DISTINCT b ) FROM t1 GROUP BY b;
  5. +-----------------+
  6. | sum(distinct b) |
  7. +-----------------+
  8. |               1 |
  9. |               2 |
  10. +-----------------+