There are two attributes you can put on your entity class properties: one is a convenience, the other is essential, and both are required when the primary ... a column called txtFirstName (because it ...

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.

The combination of the primary and foreign key columns and the rules that dictate the data that can be housed in those key columns can be defined to ensure correct and useful relational databases.