sql 删除 xml 时出错

Question

您好，我们有一个遗留代码，我们正在尝试修改并试图摆脱它 "for XML"。当前代码如下

Select  
            a.columnidfk            as columnid,
            tvs.columnversion           as columnversion,
            a.newcolumnId               as newcolumnid,
                (Select
                    at.columnTrackingId     as columntrackingid,
                    at.newcolumnIdFk            as newcolumnid,
                    at.IDBSIdFk as idbid,
                    i.Name                      as iname,
                    IsNull(convert(varchar,at.colidbdate,101),'')       as colidbdate,
                    IsNull(convert(varchar,at.colidbdate2,101),'')  as colidbdate2,
                    IsNull(at.colReason, '')            as colReason,
                    IsNull(d.DispositionText, '')       as DispositionText,
                    at.status as status
                From columnTracking at
            Left Outer Join LkIDBs i on at.IDBSIdFk = i.IDBSId
            left outer join LkDisposition d On at.[colDecisionIdFk] = d.DispositionId
        Where at.status in('Active','Inactive')  and at.newcolumnIdFk = a.newcolumnId and (i.status in ('Active','Inactive') OR i.status is null) and (d.status='Active' or d.status is null) 
        for Xml path('columntracking'), type)
        From tablecolumns a             
        Left Outer Join columnVersions tvs on a.columnversionidfk = tvs.columnversionid Where 
        a.columnVersionIdFk in
        (Select columnVersionId From columnVersions tv
            Inner Join tabcolumns t On tv.colIdFk = t.colId 
            Where t.TicketNo = @TicketNo )
        order by a.TicketVersionIdFk , a.assessmentid
        For Xml path('columntab'), Root('columns')

当我删除“for Xml 路径（'columntracking'）时，键入”和“For Xml path('columntab'),Root('columns')" 我收到以下错误

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

请指教！

Answer 1

我相信我通过加入（第一个 xml 输出）

得到了想要的 table

Select  
            a.columnidfk            as columnid,
            tvs.columnversion           as columnversion,
            a.newcolumnId               as newcolumnid,
            att.columntrackingid,
            att.newcolumnid,
            att.idbid,
            att.iname

        From tablecolumns a             
        Left Outer Join columnVersions tvs on a.columnversionidfk = tvs.columnversionid Where 
        left outer join (
        Select
                    at.columnTrackingId     as columntrackingid,
                    at.newcolumnIdFk            as newcolumnid,
                    at.IDBSIdFk as idbid,
                    i.Name                      as iname,
                    IsNull(convert(varchar,at.colidbdate,101),'')       as colidbdate,
                    IsNull(convert(varchar,at.colidbdate2,101),'')  as colidbdate2,
                    IsNull(at.colReason, '')            as colReason,
                    IsNull(d.DispositionText, '')       as DispositionText,
                    at.status as status
                From columnTracking at
            Left Outer Join LkIDBs i on at.IDBSIdFk = i.IDBSId
            left outer join LkDisposition d On at.[colDecisionIdFk] = d.DispositionId
        Where at.status in('Active','Inactive')  and (i.status in ('Active','Inactive') OR i.status is null) and (d.status='Active' or d.status is null) 
        ) att on att.newcolumnid = a.newcolumnId
        and a.columnVersionIdFk in
        (Select columnVersionId From columnVersions tv
            Inner Join tabcolumns t On tv.colIdFk = t.colId 
            Where t.TicketNo = @TicketNo )

sql 删除 xml 时出错

sql error on for xml removal

sql

sql-server

sql-server-2008

tsql