如何将列转换为行SQL

Question

我需要在MS Sql.so中将列转换为行，所以我尝试了以下代码

DECLARE @colsUnpivot AS NVARCHAR(MAX),
   @query  AS NVARCHAR(MAX)

select @colsUnpivot = stuff((select ','+quotename(C.name)
         from sys.columns as C
         where C.object_id = object_id('tbl_login_settings') 

         for xml path('')), 1, 1, '')

set @query 
  = 'select  value
     from tbl_login_settings
     unpivot
     (
        value
        for year in ('+ @colsunpivot +')
     ) lab_name'

exec(@query)

它的工作正常，但问题是将所有列（所有行值）转换为行。

我需要特定的列（行值）成行

例如

sno/ name/ visible// column name
1  / sam / show
2  / ram / hide // i need to convert this rows like below
3  / mick / show

values// column name
2
ram
hide

Answer 1

尝试这个

DECLARE @colsUnpivot AS NVARCHAR(MAX),
   @query  AS NVARCHAR(MAX)

select @colsUnpivot = stuff((select ','+quotename(C.name)
         from sys.columns as C
         where C.object_id = object_id('tbl_login_settings') 

         for xml path('')), 1, 1, '')

set @query 
  = 'select  value
     from tbl_login_settings where sno = 2
     unpivot
     (
        value
        for year in ('+ @colsunpivot +')
     ) lab_name'

exec(@query)