Learn how to add and remove Primary Keys from an Access database table. The primary key's purpose is to promptly associate data from multiple tables and combine that data.

Can you do a foreign key within a single table, though? I've only ever seen foreign key constraints tying a field in one table to a field in another table.

The primary key of a table may also be linked to a foreign key. This allows two tables to be linked. Special care must be taken while inserting data and removing data from the foreign key column.

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