1.MySQL 的 YEARWEEK 是获取年份和周数的一个函数，函数形式为 YEARWEEK(date[,mode])

例如 2010-3-14 ，礼拜天

SELECT YEARWEEK('2010-3-14') 返回 11

SELECT YEARWEEK('2010-3-14',1) 返回 10

其中第二个参数是 mode ，具体指的意思如下：

 Mode First day of week Range Week 1 is the first week …

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

2. weekofyear函数是计算出当前日期所在周数，和YEARWEEK('日期',1)的周数一致，但YEARWEEK('日期',1)在小于10的时候，不带0

select WEEKOFYEAR('2016-2-2'); =5