A primary key is a field used to uniquely identify every record in the database. Sometime primary keys are obvious, for example a car license plate could be used to uniquely identify cars. Often ...

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

Now run dbt and watch it fail to drop the primary key constraint. Expected behavior This SQL should have CASCADE at the end when a primary key constraint is dropped, so that foreign key constraints ...