Hi, Gurus:
I have one question as follows:
We need to migrate a legacy system to a new production server. I am required to add two columns to every table in order to record who updates the row most recently through triggers, and I should apply not null constraint to the columns . However, since legacy system already has data for every table, and old data does not have value for the 2 new columns. If we apply the constraint, all of existing rows will raise exception. I wonder if there is possibility to apply the constraint ONLY to new rows to come in future.
Thanks.
Sam