1.MySQL 的 YEARWEEK 是獲取年份和周數(shù)的一個(gè)函數(shù)，函數(shù)形式為?YEARWEEK(date[,mode])

例如 2010-3-14 ，禮拜天

SELECT YEARWEEK('2010-3-14') 返回 11
SELECT YEARWEEK('2010-3-14',1) 返回 10

其中第二個(gè)參數(shù)是 mode ，具體指的意思如下：

?

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

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2. weekofyear函數(shù)是計(jì)算出當(dāng)前日期所在周數(shù)，和YEARWEEK('日期',1)的周數(shù)一致，但YEARWEEK('日期',1)在小于10的時(shí)候，不帶0

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

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