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<i><p>A weak entity set is a type of entity set in a database that does not have a primary key attribute of its own to uniquely identify its individual instances. Instead, it relies on another entity, ...
Relationship strength can be strong or weak based on how to define PK of a related entity. To implement a relationship, the PK of one entity (parent entity, normally on the “one” side of 1:M ...
The nondeterministic or deterministic entity-relationship model of a database is formaRy defined as a user's view of that database in terms of a collection of time-varying relations: the regular or ...
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