How to use the WEEK function in MySQL
- 王林forward
- 2023-05-28 13:46:061876browse
WEEK(date，index)
SELECT WEEK(‘2016-01-03') SELECT WEEK(‘2016-01-03', 0) SELECT WEEK(‘2016-01-03', 1)
-> 1 (该函数返回date在一年当中的第几周，date(01.03)是周日，默认是以为周日作为一周的第一天，函数在此处返回1可以有两种理解：1、第一周返回0，第二周返回1，.... ,2、以当年的完整周开始计数，第一周返回1，第二周返回2，... ，最后一周返回53) -> 1 (week()默认index就是0. 所以结果同上) -> 0 (当index为1时，表示一周的第一天是周一，所以，4号周一才是第二周的开始日)
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