SQL Server:无法对包含聚合或子查询的表达式执行聚合函数

我当前收到错误信息：

无法对包含聚合或子查询的表达式执行聚合函数

完整查询：

query = "SELECT * FROM (SELECT" +
" IDWebsite = Websites.Id, " +
" Websites.Title, " +
" Websites.Description, " +
" Websites.Url, " +
" Websites.BannerURL,  " +
" (Select Count(*) From Votes where WebsiteID = Websites.Id) as TotalVotes, " +
" AVG(ISNULL((Select Rating From WebsiteRating where WebsiteID = Websites.Id), 5)) as Rating, " +
" Users.Username, " +
" Websites.ID, " +
" (Select Count(*) From Redirects where WebsiteID = Websites.Id) as websiteCount, " +
" RowNum = ROW_NUMBER() OVER (ORDER BY Websites.ID) " +
" FROM Websites " +
" INNER JOIN Users ON Websites.UserID = Users.Id " +
" LEFT OUTER JOIN Votes AS Votes_1 ON Votes_1.WebsiteID = Websites.Id  " +
" LEFT OUTER JOIN Redirects AS Redirects_1 ON Redirects_1.WebsiteID = Websites.Id " +
" LEFT OUTER JOIN WebsiteRating AS WebsiteRating_1 ON WebsiteRating_1.WebsiteID = Websites.Id " +
" GROUP BY Websites.Title, Websites.Description, Websites.Url, Websites.BannerURL , Users.Username, Websites.ID" +
") as Table1 " +
"WHERE RowNum > " + number + " And RowNum <= " + amount + " " +
"Order by TotalVotes ";

我试图用教程来修复它，但不幸的是，我遇到了其他各种错误。我还是一个初学者，所以我对SQL没有太多的知识

如果有人能帮助我，我将非常感激

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提前感谢。

问题在于您的子查询。读取/修改作为一组长字符串连接表示的查询非常困难。最好只在问题中显示查询

考虑这个子查询：

(Select Count(*) From Votes where WebsiteID = Websites.Id) as TotalVotes

问题是外部查询没有很好地定义

Websites.Id

。你有三个选择。首先，您可以将其更改为：

(Select Count(*) From Votes where WebsiteID = max(Websites.Id)) as TotalVotes

或者，您可以将

Websites.Id

包含在

groupby

子句中

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或者，您实际上可以对

分组依据中的字段执行比较逻辑

不连接查询。这使您容易受到SQL注入的影响。

(Select Count(*) From Votes where WebsiteID = max(Websites.Id)) as TotalVotes