sql-server - 遍历名称为 T-SQL 的列

Question

我有这个查询：

  Select ac.*,cp.NOMECAMPO as fieldname
FROM optes op 
    inner join  artico art on art.id=op.IDARTICO
    inner join SAM.ArtCla3ID13 ac on ac.idartico=art.id 
    inner join CAMPIPERS cp on cp.TABELLA = 'ArtCla3ID3'
WHERE op.id = 54782.000000 

返回如下内容：

    rivestimento | numtaglienti | raggio | diamscarico | fieldname    |
    ______________________________________
    nuda         |       0      |    0   |     1     |  diamscarico |
    nuda         |       0      |    0   |     1     |  diamscarico |

我怎么能有这个？

diamscarico |  1
raggio      |  0
numtaglienti|  0
rivestimento|  nuda

谢谢！

Answer 1

您可以将查询结果放入 XML 变量中，并在查询 XML 时进行反透视。

declare @XML xml

set @XML = 
  (
    -- Your query goes from here
    select *
    from YourTable
    -- to here
    for xml path(''), type
  )

select T.X.value('local-name(.)', 'sysname') as ColumnNaame,
       T.X.value('./text()[1]', 'nvarchar(max)') as Value
from @XML.nodes('*') as T(X)

SQL小提琴

Answer 2

您可以使用UNPIVOT

WITH tbl AS (
  Select ac.*
  FROM optes op 
    inner join  artico art on art.id=op.IDARTICO
    inner join SAM.ArtCla3ID13 ac on ac.idartico=art.id 
    inner join CAMPIPERS cp on cp.TABELLA = 'ArtCla3ID3'
  WHERE op.id = 54782.000000 
)
SELECT DISTINCT upp.column_name , upp.[value] 
FROM tbl
UNPIVOT
([value] for column_name IN ([rivestimento], [numtaglienti], [raggio], [diamscarico])) upp

Answer 3

它适用于静态表名，但我需要它是动态的。

这是我的代码

declare @artcla3 varchar(20)
declare @XML xml


select @artcla3='ArtCla3ID'+ convert(varchar,art.IDARTCLA3)
            FROM optes op inner join  artico art on art.id=op.IDARTICO
            WHERE op.id = 54782.000000 


exec sp_executesql N'
    set @XML = 
      (
        SELECT ac.*,cp.NOMECAMPO,cp.TITCAMPO
        FROM optes op 
            inner join  artico art on art.id=op.IDARTICO
            inner join sam.'+@artcla3+' ac on ac.idartico=art.id 
            inner join CAMPIPERS cp on cp.TABELLA = '''+@artcla3+'''
        WHERE op.id = 54782.000000 
        for xml path(''''), type
      )
', N'@XML xml',@XML=@XML


select T.X.value('local-name(.)', 'sysname') as ColumnNaame,
       T.X.value('./text()[1]', 'nvarchar(max)') as Value
from @XML.nodes('*') as T(X)