1. Introduction to database keys

We have discussed flat-file and relational databases.

A fundamental feature of a database is the ability to point to any given record. After all, what is the use of a database if you can't get to the right records?

With this in mind, the concept of a 'key' was developed.

This mini-web will take you through what you need to know regarding

• Primary key
• Secondary key
• Foreign key