Question

我有一个从Excel电子表格导入的大表。对于包含教师姓名的五个列，我想要折叠每行中的所有空白，这样我就没有任何名字左边的空白。一个例子可能会更好地表明我的意思。

以下是数据的示例：

Student ID  Teacher1  Teacher2  Teacher3  Teacher4  Teacher5
445633      Mary                Deb       Juan  
876302      Trevor    Juan      Mary      Val       Deb
659404      Luo                                     Trevor
535485                          Deb    
775431                Val                           Luo
565002                Luo       Mary                Juan

我想把左边的空白折叠起来，所以看起来像这样：

Student ID  Teacher1  Teacher2  Teacher3  Teacher4  Teacher5
445633      Mary      Deb       Juan    
876302      Trevor    Juan      Mary      Val       Deb
659404      Luo       Trevor      
535485      Deb        
775431      Val       Luo      
565002      Luo       Mary      Juan

我必须这样做，因为我会把它粘贴到一个国家规定的Excel模板中，我不能在教师姓名的左边留下任何空白，只有在右边空白。

谢谢！

Answer 1

你可以在教师和枢轴上取消透视，ROW_NUMBER（）再次......即：

declare @t1 as table (StudentID int, Teacher1 nvarchar(100), Teacher2 nvarchar(100), Teacher3 nvarchar(100), Teacher4 nvarchar(100), Teacher5 nvarchar(100));
insert into @t1 values (445633,'Mary',NULL,'Deb','Juan',NULL),(876302,'Trevor','Juan','Mary','Val','Deb'),
(659404,'Luo',NULL,NULL,NULL,'Trevor'),(535485,NULL,NULL,NULL,'Deb',NULL),
(775431,NULL,NULL,'Val',NULL,'Luo'),(565002,NULL,NULL,'Luo','Mary','Juan');

with UnpivotT as (
    SELECT StudentID, TeacherName, TeacherColumn as OriginalColumn
    from @t1 unpivot (
        TeacherName for TeacherColumn in ([Teacher1],[Teacher2],[Teacher3],[Teacher4],[Teacher5])
    ) uT
), NewColumnT as (
    select StudentID, TeacherName,  'Teacher'+(
            convert(nvarchar(100), ROW_NUMBER() OVER (PARTITION BY StudentID ORDER BY OriginalColumn))
        ) as NewColumn
    from UnpivotT
)
select * 
from NewColumnT
pivot (
    max(TeacherName) for NewColumn in ([Teacher1],[Teacher2],[Teacher3],[Teacher4],[Teacher5])
) as pivotT

折叠每行的空白列

1 个答案: