TSQL - 聚集在HAVING子句

Question

我知道這個問題已經被問了很多，但是當我解決了錯誤信息，並使用HAVING子句，我還是接受了可怕的：

An aggregate may not appear in the WHERE clause unless it is in a 
subquery contained in a HAVING clause or a select list, 
and the column being aggregated is an outer reference. 

我在做什麼錯了，在這裏？

SELECT 
mr.ClubKeyNumber, 
COUNT(mr.MonthlyReportID), 
SUM(CONVERT(int,mr.Submitted)) 
FROM MonthlyReport mr 
WHERE mr.ReportYear = 2014 
AND COUNT(mr.MonthlyReportID) = 12 
GROUP BY mr.ClubKeyNumber 
HAVING (SUM(CONVERT(int,mr.Submitted))) > 11 

Answer 1

問題不在於你HAVING條款它在你的WHERE條款。

您的where子句的總count，試試這個：

SELECT 
mr.ClubKeyNumber, 
COUNT(mr.MonthlyReportID), 
SUM(CONVERT(int,mr.Submitted)) 
FROM MonthlyReport mr 
WHERE mr.ReportYear = 2014 
GROUP BY mr.ClubKeyNumber 
HAVING (SUM(CONVERT(int,mr.Submitted))) > 11 and COUNT(mr.MonthlyReportID) = 12 

的where條款檢查每一行group by子句前被聚合。它不能count您的MonthlyReportID直到後的group by所以將其移動到having clause。

Here is a simple example你可以玩來證明哪裏有vs。