This section contains carefully selected MCQs and Previous Year Questions with explanations to help students understand concepts and prepare effectively for examinations, interviews, and competitive tests.
Q: 1SET concept used in ______________.
Option A
The SET concept is used in the Network Data Model. In this model, data is represented using records and set types, where a set defines a relationship between two record types:
A set represents a 1-to-many relationship, where one owner record can be linked to multiple member records.
| MODEL | RELATIONSHIP REPRESENTATION |
|---|---|
| Network Model | Uses set (owner-member). |
| Hierarchical Model | Uses tree structure (parent-child). |
| Relational Model | Uses tables (rows and columns). |
| Object-Oriented Model | Uses objects and classes. |
Q: 2Which of the following is a hierarchical database system?
Option B
IMS (Information Management System) is a well-known hierarchical database management system developed by IBM.
In IMS, data is organized in a tree-like structure with parent–child relationships, where each child has only one parent.
Q: 3Which of the following is not a database model?
Option D
A database model defines the structure, organization, and relationship of data in a database system. Different database models are used to represent and manage data efficiently.
Common Database Models:
However, Inheritance Model is not considered a standard database model. Inheritance is actually an Object-Oriented Programming (OOP) concept used for deriving a new class from already existing class.
Q: 4In the network database model, which type of relationship exists?
Option B
The Network Model represents relationships using the set construct, where each set consists of an owner record and one or more member records. This is known as an owner–member relationship and allows a record to have multiple parents, supporting many-to-many relationships.
Q: 5Which database model uses a tree data structure?
Option B
The hierarchical database model organizes data in a tree-like structure, where each parent record can have multiple child records, but each child has only one parent. This represents a one-to-many relationship.
| DATA MODEL | STRUCTURE USED | DESCRIPTION |
|---|---|---|
| Hierarchical Model | Tree | Data is organized in parent–child form with one-to-many relationships. |
| Network Model | Graph | Records are connected using pointers allowing many-to-many relationships. |
| Relational Model | Tables (Rows & Columns) | Data is stored in tables and accessed using SQL. |
| Entity-Relationship (E-R) Model | Diagrammatic | Used for conceptual database design using entities and relationships. |
| Object-Oriented Model | Objects | Data is stored as objects with attributes and methods. |
| Object-Relational Model | Tables and Objects | Relational model extended with object-oriented features. |
| Distributed Data Model | Multiple sites | Data is stored across different locations but works as one database. |
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