摺疊每行的空白列

Question

我有一張從Excel電子表格導入的大表格。對於包含教師姓名的五列，我想摺疊每行中的所有空白，所以我沒有任何姓名左側的空白。一個例子可能會更好地表明我的意思。

這裏的數據的例子現在：

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 

而且我想空白崩潰的左側，所以它看起來是這樣的：

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 

我必須這樣做這種方式是因爲我將它粘貼到一個國家規定的Excel模板中，而且我無法在教師姓名的左邊留下任何空白，只有空白纔是正確的。

謝謝！

Answer 1

您可以逆透視，ROW_NUMBER（）在教師和樞軸再次...那就是：

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