SQLSRV：按一列分組，按月匯總

Question

我有一個困難的查詢要做=）

止損表具有以下列

Id, Area, SubArea, Date, StopNumber, DownTime

我想要這樣的結果：（我會嘗試描述..）

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

有人可以幫我嗎？ 謝謝 ：）

Answer 1

如果您喜歡我在評論中建議的方法，則可以嘗試如下操作：

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

Answer 2

這應該工作：

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