同一个表上的查询中的 MySQL 查询

Question

我有一个像这样的表:

Status | Quantity | PeriodDate
------------------------------
100    | 2        | 2013-07-02
100    | 3        | 2013-07-02
100    | 5        | 2013-07-02
100    | 3        | 2013-07-03
100    | 1        | 2013-07-03
100    | 0        | 2013-07-04
100    | 0        | 2013-07-04
100    | 5        | 2013-07-04
100    | 6        | 2013-07-05
100    | 4        | 2013-07-06
100    | 8        | 2013-07-06

我需要选择数据，以便它显示范围内每个不同日期的数量计数。我本以为我可以做一些事情:

SELECT DISTINCT PeriodDate, SUM(Quantity) as TotalQuantity where PeriodDate BETWEEN '2013-07-02' AND '2013-07-04'

但这会返回包含所有数量总和的一行。

我在寻找类似的东西:

TotalQuantity | PeriodDate
--------------------------
10            | 2013-07-02
4             | 2013-07-03
5             | 2013-07-04
6             | 2013-07-05

我如何实现这一目标？

Answer 1

SELECT PeriodDate, 
       SUM(Quantity) as TotalQuantity 
from your_table
where PeriodDate BETWEEN '2013-07-02' AND '2013-07-05'
group by PeriodDate