选择按周分组的 SQL 结果 [英] Select SQL results grouped by weeks

问题描述

我想按周从下表中选择数据

I want to select data from following table group by weeks

 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.

So my result should look like this.

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

有人会指导我如何编写 SQL 查询来实现这种行为！

Will some body guide me to how to write SQL query to achieve this behavior!

推荐答案

我认为应该这样做..

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

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