simple trigger problem ?

as a project i developed a simple database with oracle designer, including application forms.
Here is what the problem is:

a table customer is linked to a table adress with a many to one relationship.
when i update a customer's home adress via the form, the adress of other customers who live at the same adress is also changed. off course because if 3 customers live at the same adress, only one adress record will be in the adress table. and if one of those three customers change adresses, and i update that record, the two other customers will also have that changed adress.

I was looking for a solution with database triggers (after update on adressen), but the problem is that at that point i dont know WHICH customer changed adress.

Is there a solution with database triggers or any other? tnx for al help Received on Mon May 08 2000 - 00:00:00 CDT