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 information to some subset of the rows ...

If a primary key value is updated, three options exist for handling foreign key values: (1) Restricted UPDATE. The modification of the primary key column (s) is not allowed if foreign key values exist ...

In summary, primary keys and foreign keys in SQL, when viewed through the lens of Fortnite, illustrate the importance of unique identifiers and collaborative relationships within a database.

Designers should seek a balance to avoid an excess. When only a sub-set of the foreign keys comprise the full primary key of the fact table, it is not unusual for developers, or query writers, to ...

A foreign key integrity constraint links the data values of one or more variables in its data file to those of the variables specified in a primary key, and controls the action that can be taken when ...