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Data Modeling with ER Model - Technical MCQs

Q1:

Which of the following refers to an entity in which the identifier of one entity includes the identifier of another entity?

A Weak entity

B Strong entity

C ID-dependent entity

D ID-independent entity

ANS:C - ID-dependent entity

ID-dependent entity: entity (child) whose Identifier depends (includes) another identifier.

For example, Building:Apartment -> for describing an apartment you need to include building name and all.

Weak Entity: existence depends on another entity.

Eg: Model: Car.

All Id-dependent entity are weak, and vice-versa is not true.