sql 一行数据转多列

 with cte as
(
select 'a' as [1],'b' as [2],'c' as [3],'d' as [4],'e' as [5]
)

select '1'    as ItemName,
   [1]    as value
from cte
union all
select '2'    as ItemName,
   [2]    as value
from cte

递归查询，将一行数据的多列转换成多行多列