Error in Oracle 10g while adding Order by clause

[28490]

Hi,

In 10.2 when a query is run with GROUP BY it does not order the output by the grouped columns. In
earlier versions the output was always sorted by the the grouped columns even though there was no
ORDER BY clause present.

[Oracle Version --Oracle 10.2.0.1.0]

In order to get an ordered output,decided to add ORCDER BY clause explicitly.
But gave ORA-00904: invalid column name error for following query.

select max(acc_seq) from tbrc1wb
group by br_cd,rc_base,f r_bk_ind,bdl_ac c
union
select max(acc_seq) from tbrc1mb
group by br_cd,rc_base,f r_bk_ind,bdl_ac c
order by br_cd,rc_base,f r_bk_ind,bdl_ac c


Please suggest how to add ORDER BY clause in the above query.

[debasisdas]

It never happens that Oracle sorts records automatically with our ORDER BY clause.

It might be data in your test table is already stored in sorted order.