View problem in Oracle 10g migration

Question

Hi,
I am involved in Oracle migration from 9 to 10g.
I have a problem with a view that works in Oracle 9 but in Oracle 10g raise the following error:
ORA-01446: cannot select ROWID from, or sample, a view with DISTINCT, GROUP BY etc.
In the view source there is a call to another view and in the last one another call to a view with a group by keyword because I need the max() column value in a table, so I need the group by keyword!!!
Any suggestion/work around to get the max() value without group by???
thanks

Answer 1

Hi,
Yes, MAX (and almost all the other aggregate functions) have analytic counterparts.
For example,
MAX (column_1) OVER (PARTITION BY column_2)calculates the same MAX that you would get with
MAX (column_1)
GROUP BY  column_2But without grouping.
(I suppose you'll still want to get only one row per group in your view, but there are ways to do that without using GROUP BY.)
If you need help, post:
some sample data (from the base tables),
the output you want from that data (that is, the contents of the view), and
your existing view definition.