15.00 - Definition of Cardinality - Teradata Database

Teradata Database Design

prodname
Teradata Database
vrm_release
15.00
category
User Guide
featnum
B035-1094-015K

Definition of Cardinality

With respect to E-R theory, the term cardinality refers to the integer number represented by the symbol M in a 1:M or M:M relationship. This number describes the constraint on the number of entity instances that are related through the relationship.

In this context, cardinality does not refer to the number of tuples in a relation.