計數和ORDER BY

Question

我有一個表叫MaintenanceRequests，它列出了大廈＃，信，ReqeustDate，說明，分辨率，CompletedDate和MaterialsUsed

我希望能夠來算每建築維修請求數。因此，如果1A有10個請求，1B有3個，則1號樓有13個請求。然後，我想只顯示前3

我有這樣的：

SELECT TOP 3 Building, Count(Letter) AS NumberofRequests 
FROM MaintenanceRequests 
GROUP BY Building 
ORDER BY NumberofRequests DESC; 

但是當我去運行它要求我爲NumberofRequests參數查詢。

我該如何解決這個問題？

感謝

Answer 1

整理彙總，而不是直接通過它的別名

SELECT TOP 3 Building, Count(Letter) AS NumberofRequests 
FROM MaintenanceRequests 
GROUP BY Building 
ORDER BY Count(Letter) DESC;