sql - SQLSRV：按一列分组并按月求和

Question

我有一个困难的查询要做=)

Stops表具有以下列

Id, Area, SubArea, Date, StopNumber, DownTime

我想要这样的结果：（我会尝试描述..）

    Area, SubArea, SUM(StopNumber appened in january) as GEN,
     SUM(StopNumber appened in february) as FEB, etc..
FROM Stops
GROUP BY Area, SubArea

有人可以帮我吗？谢谢你 ：）

Answer 1

如果您喜欢我在评论中建议您的方法，您可以尝试以下方法：

SELECT Area, SubArea, MONTH(Date) AS Month, SUM(StopNumber) AS NumStops
    FROM Stops
    GROUP BY Area, SubArea, MONTH(Date)

Answer 2

这应该有效：

SELECT Area, SubArea,
SUM(CASE Month(Date) WHEN 1 THEN 1 ELSE 0 END) AS Jan,
SUM(CASE Month(Date) WHEN 2 THEN 1 ELSE 0 END) AS Feb,
SUM(CASE Month(Date) WHEN 3 THEN 1 ELSE 0 END) AS Mar,
SUM(CASE Month(Date) WHEN 4 THEN 1 ELSE 0 END) AS Apr,
SUM(CASE Month(Date) WHEN 5 THEN 1 ELSE 0 END) AS May,
SUM(CASE Month(Date) WHEN 6 THEN 1 ELSE 0 END) AS Jun,
SUM(CASE Month(Date) WHEN 7 THEN 1 ELSE 0 END) AS Jul,
SUM(CASE Month(Date) WHEN 8 THEN 1 ELSE 0 END) AS Aug,
SUM(CASE Month(Date) WHEN 9 THEN 1 ELSE 0 END) AS Sep,
SUM(CASE Month(Date) WHEN 10 THEN 1 ELSE 0 END) AS Oct,
SUM(CASE Month(Date) WHEN 11 THEN 1 ELSE 0 END) AS Nov,
SUM(CASE Month(Date) WHEN 12 THEN 1 ELSE 0 END) AS [Dec]
FROM Stops
GROUP BY Area, SubArea