*

运算符说明

* 运算符用于乘法运算。

语法结构

1. > SELECT value1*value2;

1. > SELECT column1*column2... FROM table_name;

示例

1. mysql> select 1123.2333*1233.3331;
2. +-----------------------+
3. | 1123.2333 * 1233.3331 |
4. +-----------------------+
5. |    1385320.8079122303 |
6. +-----------------------+
7. 1 row in set (0.01 sec)

1. create table t2(c1 int, c2 int);
2. insert into t2 values (-3, 2);
3. insert into t2 values (1, 2);

5. mysql> select c1*2 from t2;
6. +--------+
7. | c1 * 2 |
8. +--------+
9. |     -6 |
10. |      2 |
11. +--------+
12. 2 rows in set (0.00 sec)

14. mysql> select c1*c2 from t2;
15. +---------+
16. | c1 * c2 |
17. +---------+
18. |      -6 |
19. |       2 |
20. +---------+
21. 2 rows in set (0.01 sec)