Thanks friend,

Yes u have a point there, but if some fraud want to mislead info, he
will update the primary key column to different values, and u can not
distinguish what was the orig value w/o referring to rowid or am I
making sense?

Im confused about this primary key thing.
Most of our tables sa primary key and also have a column with unique key...can i make the unique key column as the primary key?
instead of creating a specialize primary key like generating sequence.


thanks