unpivot with dynamic columns plus column names

Question

I\'m trying to unpivot a table with a large number of columns in the format of:

PID UID col1 col2 col3...

The dynamic SQL below will get me

Answer 1

You can reference the column name from the val for col in part of the unpivot. Col gets the column name

Example Fiddle

-- 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