Column Ambiguosly Define error

Question

Hi,
I have a query that goes like this
select * from
(      select a.data1, b.data2
     from table1 a, table2 b
     where a.xxx = b.xxx
union all     
     select a1.data1, b1.data2
     from table11 a1, table21 b1
     where a1.xxx1 = b1.xxx1
union all     
     select a2.data1, b2.data2
     from table31 a2, table32 b2
     where a2.xxx2 = b2.xxx2
when i run this query, i get the error "*Column Ambiguosly Defined*" error. However when i run the query without hte explicit select i.e.
select a.data1, b.data2
     from table1 a, table2 b
     where a.xxx = b.xxx
union all     
     select a1.data1, b1.data2
     from table11 a1, table21 b1
     where a1.xxx1 = b1.xxx1
union all     
     select a2.data1, b2.data2
     from table31 a2, table32 b2
     where a2.xxx2 = b2.xxx2
this query returns valid data. i need this data to be part of a custom report and need to add the select * from to the whole result set.
Please respond to this query and provide me with a valid solution for the same.
Thanks in advance
Bharath

Answer 1

Your constant re-posting of this message is NOT increasing your chances of getting a solution.
This forum is not a chat line, and it is not paid support.
No one is responsible for monitoring it and giving a quick response.
Furthermore, it is a global forum. The person with the information you seek may very well live 20 time zones away from you and was going to bed just as you posted. He will not even see your post for several more hours.
Your original post went up in the middle of the night for half the world.
No one with the information you seek is deliberately withholding it until you sound sufficiently desperate.