MCQ IN COMPUTER SCIENCE & ENGINEERING

Detailed explanation-1: -What is ER Diagram? ER Diagram stands for Entity Relationship Diagram, also known as ERD is a diagram that displays the relationship of entity sets stored in a database. In other words, ER diagrams help to explain the logical structure of databases.

Detailed explanation-2: -An entity set is a group of similar entities and these entities can have attributes. In terms of DBMS, an entity is a table or attribute of a table in database, so by showing relationship among tables and their attributes, ER diagram shows the complete logical structure of a database.

Detailed explanation-3: -ER models, also called an ER schema, are represented by ER diagrams. ER modelling is based on two concepts: Entities, defined as tables that hold specific information (data) Relationships, defined as the associations or interactions between entities.

Detailed explanation-4: -An Entity Relationship Diagram is a diagram that represents relationships among entities in a database. It is commonly known as an ER Diagram. An ER Diagram in DBMS plays a crucial role in designing the database. Today’s business world previews all the requirements demanded by the users in the form of an ER Diagram.