计数和ORDER BY

Question

我有一个表叫MaintenanceRequests，它列出了大厦＃，信，ReqeustDate，说明，分辨率，CompletedDate和MaterialsUsed

我希望能够来算每建筑维修请求数。因此，如果1A有10个请求，1B有3个，则1号楼有13个请求。然后，我想只显示前3

我有这样的：

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

但是当我去运行它要求我为NumberofRequests参数查询。

我该如何解决这个问题？

感谢

Answer 1

整理汇总，而不是直接通过它的别名

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