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
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