sql函数 的 SQL WEEK()函数

WEEK(date[,mode])

此函数返回日期的周数。双参数的形式WEEK()允许你指定星期是否开始于周日或周一,以及是否返回值应在范围从0到53或从1到53。 如果省略了mode参数,系统default_week_format变量的值被使用

Mode 一个星期的第一天 范围 Week 1 是第一个星期
0 Sunday 0-53 with a Sunday in this year
1 Monday 0-53 with more than 3 days this year
2 Sunday 1-53 with a Sunday in this year
3 Monday 1-53 with more than 3 days this year
4 Sunday 0-53 with more than 3 days this year
5 Monday 0-53 with a Monday in this year
6 Sunday 1-53 with more than 3 days this year
7 Monday 1-53 with a Monday in this year

mysql> SELECT WEEK('1998-02-20');
+---------------------------------------------------------+
| WEEK('1998-02-20')                                      |
+---------------------------------------------------------+
| 7                                                       |
+---------------------------------------------------------+
1 row in set (0.00 sec)

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