IS THERE ANY WAY TO TRIGGER LOW COLLATION OF NULLS IN ORACLE (Maybe an environment variable). eg. select * from table order by column2 - where table contains 3 records:
A NULL
A XXXX
B NULL

displays:

A XXXX
A NULL
B NULL

but required order is (As per INFORMIX):
A NULL
A XXX
B NULL

NOTE: Obviously this is a simplified case