Question

为了避免“如果指定了SELECT DISTINCT，ORDER BY项必须出现在选择列表中。”，我需要将AssessmentSuperSet.Deadline添加到顶部的SELECT语句中。我应该在哪里这样做？任何帮助非常感谢。感谢。

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

select @cols = STUFF(
    (SELECT distinct ',' + QUOTENAME(AssessmentSuperSet.Title) 
            from AssessmentSuperSet inner join AssessmentSet on AssessmentSuperSet.SuperSetID =     AssessmentSet.SuperSetID
            where ClassID = '8KF/En 14/15' order by AssessmentSuperSet.Deadline ASC
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
,1,1,'')

set @query = 'SELECT StudentID, FName, SName, ' + @cols + ' from 
     (
        select KS3Assessments.StudentID,
          Pupils.FName,
          Pupils.SName,
          KS3Assessments.NCLevel,
          AssessmentSuperSet.Title
        from KS3Assessments inner join Pupils on KS3Assessments.StudentID = Pupils.StudentID
                            inner join AssessmentSuperSet on KS3Assessments.SuperSetID = AssessmentSuperSet.SuperSetID                              
        where Pupils.GroupDesignation = ''8KF/En 14/15''
    ) x
    pivot (max(NCLevel) for Title in (' + @cols + ') ) p '

execute(@query)

Answer 1

使用group by子句代替不同的尝试：

select @cols = STUFF(
    (SELECT ',' + QUOTENAME(AssessmentSuperSet.Title) 
            from AssessmentSuperSet inner join AssessmentSet on AssessmentSuperSet.SuperSetID =     AssessmentSet.SuperSetID
            where ClassID = '8KF/En 14/15' 
          group by AssessmentSuperSet.title, AssessmentSuperSet.Deadline
          order by AssessmentSuperSet.Deadline ASC
    FOR XML PATH(''), TYPE
    ).value('.', 'NVARCHAR(MAX)') 
,1,1,'')

set @query = 'SELECT StudentID, FName, SName, ' + @cols + ' from 
     (
        select KS3Assessments.StudentID,
          Pupils.FName,
          Pupils.SName,
          KS3Assessments.NCLevel,
          AssessmentSuperSet.Title
        from KS3Assessments inner join Pupils on KS3Assessments.StudentID = Pupils.StudentID
                            inner join AssessmentSuperSet on KS3Assessments.SuperSetID = AssessmentSuperSet.SuperSetID                              
        where Pupils.GroupDesignation = ''8KF/En 14/15''
    ) x
    pivot (max(NCLevel) for Title in (' + @cols + ') ) p '

execute(@query)

由于您没有提供任何合适的测试数据，我还没有尝试过。

如何按字段向此选择语句添加订单？

1 个答案: