*
运算符说明
*
运算符用于乘法运算。
语法结构
> SELECT value1*value2;
> SELECT column1*column2... FROM table_name;
示例
mysql> select 1123.2333*1233.3331;
+-----------------------+
| 1123.2333 * 1233.3331 |
+-----------------------+
| 1385320.80791223 |
+-----------------------+
1 row in set (0.01 sec)
create table t2(c1 int, c2 int);
insert into t2 values (-3, 2);
insert into t2 values (1, 2);
mysql> select c1*2 from t2;
+--------+
| c1 * 2 |
+--------+
| -6 |
| 2 |
+--------+
2 rows in set (0.00 sec)
mysql> select c1*c2 from t2;
+---------+
| c1 * c2 |
+---------+
| -6 |
| 2 |
+---------+
2 rows in set (0.01 sec)