sql-server – 选择按周分组的SQL结果

Date       Product Name   Sale
+----------+--------------+-----+
 14-05-11     a             2
 14-05-11     b             4 
 17-05-11     c             3
 19-05-11     a             6
 24-05-11     a             6
 29-05-11     a             6

假设今天是30-05-11

所以我的结果应该是这样的.

Product Name         First Week   Second Week  Third Week
+--------------------+------------+------------+-------------+
   a                      12            6           2
   b                       0            0           4 
   c                       0            3           0

会有一些身体引导我如何写SQL查询来实现这个行为！

解决方法

Select 
ProductName,WeekNumber,sum(sale)
from
(
    SELECT 
    ProductName,DATEDIFF(week,'2011-05-30',date) AS WeekNumber,sale
    FROM table
)
GROUP BY
ProductName,WeekNumber

（编辑：李大同）

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