Question

我希望再次查询括号中的查询结果。我在堆栈中引用了一些帖子，并提出了以下查询。但不知何故，第二个查询（括号外的查询）无法正常工作。错误表示第二个＆＃39;附近的语法不正确。有人可以请帮助。

select CourseID, count(CourseID)
from
    (select CustomisationID, CourseID , Count(CourseID)
     from tblFilter
     where CustomisationID in (43, 51) 
     group by CourseID, CustomisationID) 
group by CourseID

Answer 1

Try this

select M.CourseID, count(M.CourseID) from
(
   select CustomisationID, CourseID , Count(CourseID) AS Cnt from tblFilter where CustomisationID in (43,51) 
    group by CourseID, CustomisationID
)M 
group by M.CourseID

Answer 2

You must set alias for subquery. Try Something like this:

select CourseID, count(CourseID) 
from
(
    select CustomisationID, CourseID , Count(CourseID) AS Cnt
    from tblFilter 
    where CustomisationID in (43,51) 
    group by CourseID, CustomisationID
) AS TMP
group by CourseID

查询另一个查询的结果

2 个答案: