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A Short Glossary

To help keep the various database terms clear, let us collect their definitions in one place:

Entity

An object about which the database is designed to store information. Example: a book; that is, an ISBN, a title, and a price, as in:

0-12-333433-3, On Liberty, $25.00
Attribute

A property that (partially or completely) describes an entity. Example: title.

Entity class

An abstract group of entities, with a common description. Example: the entity class Books, representing all books in the universe.

Entity set

The set of entities from a given entity class that are currently in the database. Example: the following set of 14 books:


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