Question

Which of the following is NOT a type of database model?

• A. Relational
• B. Hierarchical
• C. Network
• D. Sequential

Hint:

The main database models are relational, hierarchical, and network, while sequential refers to how data is accessed, not how it is organized.

Answer 1

The Correct Option is D

The four main types of database models are:
- Relational (A): In this model, data is organized into tables (or relations), with relationships between the tables defined by foreign keys.
- Hierarchical (B): This model organizes data in a tree-like structure, where each record has a parent-child relationship.
- Network (C): In this model, data is organized in a graph format, where nodes represent data entities, and edges represent relationships between them.
- Sequential (D) is NOT a recognized database model. It refers to a method of data access in which records are processed in a sequential order, typically in a flat-file database, but not a database model type.
Therefore, the correct answer is (D).