I'm adding a table and subclass table to my DB. (Subclass table = table where the primary key joins to the primary key of another table, to give extra row ...

Foreign Keys Note the "FK" indications in this Erwin entity relationship modeling program. Every foreign key is a field in one table that is indexed in another. (Example courtesy of Logic Works, Inc.) ...

When working on a multidimensional design, every fact table within scope should be handled with care. In an ideal world, each low-level fact table represents the metrics related to a business event.

All the values that make up the foreign key in the rows that are referenced are set to their default value. All foreign key columns in the related table must have default constraints defined on them.

The Department ID is the primary key in the Department table that appears as a foreign key in the Teacher table to link the two. Next up. Test your understanding. Previous page. Field types.

If you permit a foreign key value to be updated, the new value must either be equal to a primary key value currently in the parent table or be null. From the perspective of the primary key, it is good ...