When you create a Microsoft Access table, Access will automatically create a primary key to your database table, but you can also specify the field you want as the primary key for your database table.

By definition, a relational database must contain normalized tables ... our example, correcting a misspelled name probably won’t have too many repercussions. But suppose your primary key ...

A primary key is a field used to uniquely identify every record in the database ... In the school example, the primary key used to identify each member of staff in the teacher table is Staff ...

For example ... then more semantics-founded primary keys would come to light. However, the obvious flaw with that line of reasoning is that without establishing the logical model first, who can say ...