Articles
Week 4: Articles
The articles for this week focus on mandatory and optional relationships between rows in two tables or two copies of the same table. The shore version of mandatory and optional relationships are:
- A mandatory relationship requires that you provide a valid foreign key value before inserting a row in a table with a dependency on a parent table.
- An optional relationship lets you insert a row in a dependent table without associating it with a row in the parent table. This type of relationship is possible because there are generally other foreign keys that prevent the row from becoming an orphan in the data model.
Articles
