Question

what is cardinality and mapping constraint​

Answer 1

Mapping Constraint - A mapping constraint is a data constraint that expresses the number of entities to which another entity can be related via a relationship set. For binary relationship set R on an entity set A and B, there are four possible mapping cardinalities.

Cardinality - The number of elements in a set or other grouping, as a property of that grouping.

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Answer 2

A mapping constraint is a data constraint that expresses the number of entities to which another entity can be related via a relationship set R on an entity set A and B ,there are four possible mapping cardinalities . These are as follows : One to one (1 :1) One to many (1:M) .