SQL：“列'tbl.column'在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。”

Question

我不知道为什么，我发现了以下错误：
Column 'tbl.column' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
当SQL语句如下所示：
SELECT tbl.column, MAX(tblOther.columnOtherId) AS otherID FROM (tbl INNER JOIN tblOther ON tbl.columnId = tblOther.columnOtherId) INNER JOIN tblOtherAgain ON tblOther.columnOtherId = tblOtherAgain.columnAgainOtherId WHERE tblOther.columnOtherAgainId = @id。

当我删除聚合函数MAX on tblOther.columnOtherId我没有收到上述错误。那么如何让上面显示的语句在没有显示错误的情况下工作呢？

DBLIBRARY：Tedious.js

Answer 1

你必须使用一个聚合函数MAX()且有未聚合的SELECT子句中的一个领域，这就是为什么你需要有GROUP BY条款，

SELECT tbl.column, 
     MAX(tblOther.columnOtherId) AS otherID 
FROM (tbl INNER JOIN tblOther 
      ON tbl.columnId = tblOther.columnOtherId) 
     INNER JOIN tblOtherAgain 
      ON tblOther.columnOtherId = tblOtherAgain.SourceId 
WHERE tblOther.columnOtherAgainId = @id 
GROUP BY tbl.column 

Answer 2

SELECT tbl.column, MAX(tblOther.columnOtherId) AS otherID FROM (tbl INNER JOIN tblOther ON tbl.columnId = tblOther.columnOtherId) INNER JOIN tblOtherAgain ON tblOther.columnOtherId = tblOtherAgain.columnAgainOtherId WHERE tblOther.columnOtherAgainId = @id 
GROUP BY tbl.column