Question

我有一个显示学生缺席的数据透视表，执行中没有问题和数据透视的结果但是如果没有值则显示null，我想显示0而不是null。我用谷歌搜索并找到了一些尝试使用它们的方法，但我不能这样做。有人能告诉我吗？这是我的数据透视表代码：

create proc [dbo].[get_st_abs_by_stage] @Stage_ID smallint as CREATE TABLE #SummaryTable ( SName nvarchar(50), CName nvarchar(50), Stage_ID SmallInt, Sum_Abs SmallInt ) delete from #SummaryTable INSERT INTO #SummaryTable(SName, CName, Stage_ID, Sum_Abs) SELECT Student_tbl.SName,Courses_tbl.CName,Stages_tbl.Stage_ID,Sum_Abs from Absence_Summary_tbl inner join Student_tbl on Student_tbl.S_ID = Absence_Summary_tbl.S_ID inner join Stages_tbl on Stages_tbl.Stage_ID = Student_tbl.Stage_ID inner join Courses_tbl on Courses_tbl.C_ID = Absence_Summary_tbl.C_ID where Stages_tbl.Stage_ID = @Stage_ID; DECLARE @cols AS NVARCHAR(MAX), @query AS NVARCHAR(MAX) select @cols = STUFF((SELECT ',' + QUOTENAME(CName) from #SummaryTable where Stage_ID = @Stage_ID group by CName order by CName FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'') set @query = 'SELECT SName,' + @cols + ' from ( select SName, CName, Sum_Abs from #SummaryTable ) x pivot ( sum(Sum_Abs) for CName in (' + @cols + ') ) p ' execute(@query);

Answer 1

您可以使用isnull为cols生成另一个变量。像这样的东西

select @cols = STUFF((SELECT ',' + QUOTENAME(CName) 
                    from #SummaryTable
                    where Stage_ID = @Stage_ID
                    group by CName
                    order by CName
            FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'')
select @isnull_cols = STUFF((SELECT ', isnull(' + QUOTENAME(CName) + ', 0) as ' + QUOTENAME(CName)
                    from #SummaryTable
                    where Stage_ID = @Stage_ID
                    group by CName
                    order by CName
            FOR XML PATH(''), TYPE ).value('.', 'NVARCHAR(MAX)') ,1,1,'')
set @query = 'SELECT SName,' + @isnull_cols + ' from 
             (
                select SName, CName, Sum_Abs
                from #SummaryTable
             ) x
            pivot 
             (
                sum(Sum_Abs)
                for CName in (' + @cols + ')
             ) p '
execute(@query);

如何在数据透视表输出值中将NULL替换为0

1 个答案: