For everyone normalizing their designs, just remember: There ain't no such thing as a partial foreign key. When a project pretends that partial foreign keys are a valid concept, the end result is a ...

To link databases together to create a relational database, a foreign key is used. A foreign key is a field in one table that is linked to the primary key in another table.

Databases support date logic, but not-so-much the more arbitrary needs. Some might say that dates were different because they don’t ever change. Well, dates have changed at points in the past. If we ...