-

运算符说明

- 运算符用于减法运算。

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 |
+-----------------------+
|   -110.09979999999996 |
+-----------------------+
1 row in set (0.00 sec)

create table t2(c1 int, c2 int);
insert into t2 values (-3, 2);
insert into t2 values (1, 2);
mysql> select c1-5 from t2;
+--------+
| c1 - 5 |
+--------+
|     -8 |
|     -4 |
+--------+
2 rows in set (0.00 sec)
mysql> select c1-c2 from t2;
+---------+
| c1 - c2 |
+---------+
|      -5 |
|      -1 |
+---------+
2 rows in set (0.01 sec)