Database Management System × The Relational Data Model and Relational Database

Informal Definitions

Posted by AJ × 21:10

RELATION:

A Relation is table of values. A relation may be thought of as a set of rows. A relation may alternately be though of as a set of columns. Each row represents a fact that corresponds to a real-world entity or relationship. Each row has a value of an item or set of items that uniquely identifies that row in the table. Sometimes row-ids or sequential numbers are assigned to identify the rows in the table. Each column typically is called by its column name or column header or attribute name.