如何使用GROUP BY（日期）在MySQL在一週的某一天開始

Question

如果我有一個MySQL查詢按周合計不等的情況，如：

select sum(keyword1), sum(keyword2), sum(keyword3), dateTime 
from myTable 
group by week(dateTime) 
order by dateTime asc 

我發現周出現從星期天開始。

這可以更改爲星期一嗎？

列dateTime是MySQL時間戳格式2011-09-26 12:34:32。

Answer 1

mysql> select week('2011-09-25', 1); 
+-----------------------+ 
| week('2011-09-25', 1) | 
+-----------------------+ 
|     38 | 
+-----------------------+ 

mysql> select week('2011-09-25', 0); 
+-----------------------+ 
| week('2011-09-25', 0) | 
+-----------------------+ 
|     39 | 
+-----------------------+ 

所以除去有一天，http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html#sysvar_default_week_format

Answer 2

您希望週日屬於前一週所以從它

select sum(keyword1), sum(keyword2), sum(keyword3), week(DATE_SUB(dateTime, INTERVAL 1 DAY)) my_week 
from myTable 
group by week(DATE_SUB(dateTime, INTERVAL 1 DAY)) 
order by my_week asc