Question

如果现在没有数据，如何确保始终返回结果集？

现在，如果#TMP_SUMMARY1没有返回任何行。

如何确保以下查询返回给我一个没有行的表，而不只是显示此消息选项卡，下面显示此消息并且没有结果选项卡。

（0行（s）受影响）

这种情况下没有返回结果集会让我成为一场噩梦！

IF (@SUMMARY = 'Agent Summary')

BEGIN


DECLARE @cols1 AS NVARCHAR(MAX),
    @colSum1 AS NVARCHAR(MAX),
    @query1  AS NVARCHAR(MAX)

select @cols1 = STUFF((SELECT distinct ',' + QUOTENAME(Agent) 
                    from #TMP_SUMMARY1
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') ,1,1,'')
print @cols1

select @colSum1 = STUFF((SELECT distinct ', Sum(' + QUOTENAME(Agent)+') as ' +QUOTENAME(Agent)
                    from #TMP_SUMMARY1
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') ,1,1,'')

print @colSum1 

set @query1 = 'select 
                case when [PAYMENT TYPE] is null then ''*GRAND TOTAL'' else [Credit/Debit] end [Credit/Debit],
                case when [PAYMENT TYPE] is null then '''' else [PAYMENT TYPE] end [PAYMENT TYPE],
                '+@colSum1 +'
              from
              (
                select  [Agent] , 
                  [Credit/Debit], 
                  [PAYMENT TYPE], 
                  value
                from #TMP_SUMMARY2
                unpivot
                (
                  value
                  for [Credit/Debit] in ([Amount Credit], [Amount Debit])

                ) unpiv
              ) src
              pivot
              (
                sum(value)
                for agent in ('+@cols1+')
              ) piv
              group by GROUPING SETS ([Credit/Debit], [PAYMENT TYPE]), ([Credit/Debit])'

execute(@query1)  

END

Answer 1

如果＃TMP_SUMMARY1中没有行，则@ cols1和@colsum1的值将为null，并且动态sql将具有无效语法。为什么不用

包装动态sql

If (@cols1 is not null)

并且在没有列时不执行该语句。

结果集未返回

1 个答案: