Not sure, but I think what you call 1: 1 is actually prominent DBML as 1: *, because a list can "have" many of your fk tables, for example. one emley oyee may have one city, but each city may “have” many employees.
AFAIK the primary key in each table is a prerequisite without which DBML will not "work". When you save it, an error occurs. Your project will compile, but you will see errors later. NTN
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