合併查詢結果

Question

我知道我想做什麼，但我正在努力尋找最好的方法來做到這一點。

我有一個回我一些數據的查詢：

SELECT 
[Description] As [Name], month([OccuredOn]) as [Month], year([OccuredOn]) AS [Year],  COUNT([id]) AS Cnt 
FROM MyTable 
GROUP BY [Description], Year([OccuredOn]), Month([OccuredOn]) 
ORDER BY [Description],Year([OccuredOn]), month([OccuredOn]) 

的問題是我需要一些結果合併成一個。

以下是我想要做的，但我需要能夠將string1和string2的記錄合併到一個單一的string3記錄中。

SELECT 
CASE [Description] 
    WHEN 'String1' THEN 'String3' 
    WHEN 'String2' THEN 'String3' 
    ELSE [Description] 
END As [Name], 
month([OccuredOn]) as [Month], year([OccuredOn]) AS [Year], COUNT([id]) AS Cnt 
FROM MyTable 
GROUP BY [Description], Year([OccuredOn]), Month([OccuredOn]) 
ORDER BY [Description],Year([OccuredOn]), month([OccuredOn]) 

我知道上面是不是要做到這一點，但希望有人能指出一個方法可以讓我回到我的結果，其中有字符串1或字符串2回報作爲一個單一的唯一的行那天有任何說明累計計數。

上面的SQL顯然返回兩批數據的字符串1和字符串

感謝

Answer 1

你傳播你的case到group by和order by條款

SELECT 
CASE [Description] 
    WHEN 'String1' THEN 'String3' 
    WHEN 'String2' THEN 'String3' 
    ELSE [Description] 
END As [Name], 
month([OccuredOn]) as [Month], year([OccuredOn]) AS [Year], COUNT([id]) AS Cnt 
FROM MyTable 
GROUP BY CASE [Description] 
    WHEN 'String1' THEN 'String3' 
    WHEN 'String2' THEN 'String3' 
    ELSE [Description] 
END, Year([OccuredOn]), Month([OccuredOn]) 
ORDER BY CASE [Description] 
    WHEN 'String1' THEN 'String3' 
    WHEN 'String2' THEN 'String3' 
    ELSE [Description] 
END,Year([OccuredOn]), month([OccuredOn]) 

Answer 2

你能做到這一點？

SELECT * 
FROM (SELECT 
     CASE [Description] 
     WHEN 'String1' THEN 'String3' 
     ELSE [Description] 
     END As [Name], 
     month([OccuredOn]) as [Month], year([OccuredOn]) AS [Year], COUNT([id]) AS Cnt 
     FROM MyTable 
     UNION 
     SELECT 
     CASE [Description] 
     WHEN 'String2' THEN 'String3' 
     ELSE [Description] 
     END As [Name], 
     month([OccuredOn]) as [Month], year([OccuredOn]) AS [Year], COUNT([id]) AS Cnt 
     FROM MyTable) 
GROUP BY [Description], Year([OccuredOn]), Month([OccuredOn]) 
ORDER BY [Description],Year([OccuredOn]), month([OccuredOn])