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Logical ERD models information gathered from business requirements. Entities and relationships modeled in such ERD are defined around the business's need. The need of satisfying the database design is not considered yet. Physical ERD represents the actual design of database.

1. Which of the following gives a logical structure of the database graphically? Explanation: E-R diagrams are simple and clear—qualities that may well account in large part for the widespread use of the E-R model.

An Entity Relationship (ER) Diagram is a type of flowchart that illustrates how “entities” such as people, objects or concepts relate to each other within a system.

Physical data models are used to visualize the physical structure of databases and data files. Logical data models are used to visualize data entities, attributes, keys, and relationships.

Logical data modeling is the process of documenting the comprehensive business information requirements in an accurate and consistent format. In a relational database, separate entities must be defined for different types of relationships.

Logical data modeling belongs to the entity relationship model, built using an Entity Relationship Diagram (known as ERD), a standard modeling technique used as a communication tool by data modelers worldwide. Within it are the complete set of business requirements but not technical components.

How to Draw an Entity Relationship Diagram Determine the Entities in Your ERD. Start by identifying the “what”s in your system or architecture. ... Add Attributes to Each Entity. ... Define the Relationships Between Entities. ... Add Cardinality to Every Relationship in your ER Diagram. ... Finish and Save Your ERD.

A conceptual data model is a model that helps to identify the highest-level relationships between the different entities, while a logical data model is a model that describes the data as much detail as possible, without regard to how they will be physically implemented in the database.