Relational Schema Diagram Specifying The Foreign Keys. There are generally three types of relationships. A value of an existing primary key value of the.
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Projectid nbhours a express the following. Pk fk1 fk2 which can help especially if you have composite keys. Thus if you have an fk that means there s a relationship too.
Thus if you have an fk that means there s a relationship too.
What may be more useful than this is a naming convention that makes it clear what is the primary key of a table easily done if you use surrogate keys by convention and what is a foreign key column. Some relational model diagrams also include a key participation label to the left of the column names in the list of columns e g. One to one one to many and many to many. For composite foreign keys foreign key property name becomes an underscore separated list of foreign key property names.
