I have a customer table that is already filled with some data, I did not take the precaution of putting a key field and I used the customer’s name as a key (yes I know it is a big mistake 
), when I want to modify the customer’s name it is not possible to do it. My alternative is to add a field Id_client that is the key, but how can I assign a key to all those already captured 
?
thanks for your support.