SQL DATE_SUB 是一个mySql函数。不象SQL DATE_ADD 函数 增加时间值，SQL DATE_SUB 将从一个日期/时间值中减去一个时间值（时间间隔）。
SQL DATE_SUB 语法
- DATE_SUB(日期表达式, INTERVAL expr type)
| Type 值 |
|---|
| MICROSECOND |
| SECOND |
| MINUTE |
| HOUR |
| DAY |
| WEEK |
| MONTH |
| QUARTER |
| YEAR |
| SECOND_MICROSECOND |
| MINUTE_MICROSECOND |
| MINUTE_SECOND |
| HOUR_MICROSECOND |
| HOUR_SECOND |
| HOUR_MINUTE |
| DAY_MICROSECOND |
| DAY_SECOND |
| DAY_MINUTE |
| DAY_HOUR |
| YEAR_MONTH |
SQL DATE_SUB 范例
- SELECT DATE_SUB('2010-08-12', INTERVAL 3 DAY) AS NewDate
结果： 2010-08-09
2.SELECT DATE_SUB('2010-08-12', INTERVAL '3-2' YEAR_MONTH) AS NewDate
结果： 2007-06-12
3.SELECT DATE_SUB('2011-09-14 2:44:36', INTERVAL '2:26' HOUR_MINUTE) AS NewDate
结果： 2011-09-14 00:18:36