Question

Translate an Entity set and Relationship set. List and explain the symbols used to draw ER Diagram.

Answer 1

Answer:

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Explanation:

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Answer 2

Entity set :

Explanation:

Entity set :

• An entity set is a group of similar kinds of entities.
• It should contain entities with attributes sharing similar values.
• Entities are described by their properties, that also known as attributes.
• All attributes have their separate values. for example, a student entity could have a name, age, class, as attributes.
• A university might have some departments. all these departments use various lecturers and provide many programs.
• Some courses make up every program. Students register in a specific program and register in varied courses.
• An instructor from a particular department takes every course, and every lecturer teaches a numerous group of students.

Relationship set :

• A relationship is nothing however associate association among 2 or additional entities.
• E.g. Tom works within the department of chemistry. Entities participate in relationships.
• we will often establish relationships with verbs or verb phrases.

Symbols wont to draw ER Diagram:

• ER Diagrams contain totally different symbols that use rectangles to represent entities, ovals to outline attributes, and diamond shapes to represent relationships.
• Entity Relationship Diagram Symbols & Notations primarily contains three basic symbols that are rectangle, oval, and diamond to represent relationships between components, entities, and attributes.
• There are some sub-elements that are based on most elements in ERD Diagram.
• ER Diagram could be visual illustration information|of knowledge of information that describes, however, data is related to each different using different ERD Symbols and Notations.

1. Rectangles: This Entity Relationship Diagram symbol represents entity sorts.
2. Ellipses: image represents attributes.
3. Diamonds: This image represents relationship varieties.
4. Lines: It links attributes to entity types and entity varieties with different relationship varieties.
5. Primary key: attributes are underlined.
6. Double Ellipses: Represent ambiguous attributes