ORACLE unpivot columns to rows

Question

ORACLE 10 Hi, I was reading several posts here and i did not come up to a simple solution

I have this data:

Transacion_ID  GROSS_AMOUNT  DISCOUNT_AMO         


        

Answer 1

Try this

Select * From (
Select 
Transacion_ID,
Case When C.lvl = 1 Then 'GROSS'
     When C.lvl = 2 Then 'DISC'
End TYPE,
Case When C.lvl = 1 Then GROSS_AMOUNT
     When C.lvl = 2 Then DISCOUNT_AMOUNT
End AMOUNT
From T
cross join (select level lvl from dual connect by level<=2) c     
) where amount is not null
order by 1

SQL DEMO

This query is based on method mentioned here