Question

Which is not a Database Model?

• A. Hierarchical
• B. Network
• C. Rotational
• D. Subsidiary

Hint:

Common database models include hierarchical, network, relational and object-oriented models. Subsidiary is not a database model.

Answer 1

The Correct Option is D

Concept: Database models define how data is logically stored, organized and related in a database system.

Step 1: Understand common database models.
The hierarchical model organizes data in a tree-like structure.
The network model organizes data using many-to-many relationships.
The relational model organizes data in tables. \[ \text{Database models} \Rightarrow \text{Hierarchical + Network + Relational} \]

Step 2: Check the odd option.
Subsidiary is not a standard database model. It is not used as a formal data model like hierarchical, network or relational. \[ \text{Subsidiary} \neq \text{Database model} \] Therefore, the correct answer is Subsidiary.