merge primary keys - cascade update


is there proceed combine twin primary keys following cascade transform influenced relationships? here's scenario:



customers (idcustomer int pk, association varchar(50), etc)



customercontacts (idcustomercontact int pk, idcustomer int fk, name varchar(50), etc)



customernotes (idcustomernote int pk, idcustomer int fk, note text, etc)



sometimes business need assimilated one. example, have fan id 1 another id 2. wish combine both, all 2 1. i know i book updates influenced tables one, nonetheless i'd some-more destiny explanation controlling cascade rules, i don't have transform book each there new charge added.



any ideas?



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