Puoi fare riferimento al nome della colonna da val for col in parte dell'unpivot. Col ottiene il nome della colonna
-- Build list of cols we want to unpivot (skip PID & UID)
declare @cols nvarchar(max)
select @cols = coalesce(@cols+N',', N'') + quotename(c.name) from syscolumns c
inner join sysobjects o on c.id = o.id and o.xtype = 'u'
where o.name = 'MyTable' and c.name not in ('PID', 'UID') order by c.colid
declare @query nvarchar(max)
select @query = N'
select PID, [UID], Col as ID, Val
from
(
select PID, UID, ' + @cols + '
from MyTable
where UID <> 0
) as cp
unpivot
(
Val for Col in (' + @cols + ')
) as up
'
exec sp_executesql @query
