Podcast
Questions and Answers
ER model stands for an Entity-Relationship. It is a ______ high-level data model.
ER model stands for an Entity-Relationship. It is a ______ high-level data model.
flowchart
It develops a conceptual design for the database. It also develops a very simple and easy to design view of ______.
It develops a conceptual design for the database. It also develops a very simple and easy to design view of ______.
data
In ER modeling, the database structure is portrayed as a diagram called an ______ diagram.
In ER modeling, the database structure is portrayed as a diagram called an ______ diagram.
entity-relationship
For example, suppose we design a school database. In this database, the student will be an entity with attributes like id, name, address, age, atc. The address can be another entity with attributes like city, street name, pin code, etc. there will be a ______ between them.
For example, suppose we design a school database. In this database, the student will be an entity with attributes like id, name, address, age, atc. The address can be another entity with attributes like city, street name, pin code, etc. there will be a ______ between them.
Component of ______ diagram
Component of ______ diagram
Entity-Relationship model is used to define the data elements and relationship for a specified ______
Entity-Relationship model is used to define the data elements and relationship for a specified ______
The address can be another entity with attributes like city, street name, pin code, etc. there will be a ______ between them.
The address can be another entity with attributes like city, street name, pin code, etc. there will be a ______ between them.
In ER modeling, the database structure is portrayed as a diagram called an entity-relationship ______.
In ER modeling, the database structure is portrayed as a diagram called an entity-relationship ______.
ER model stands for an Entity-Relationship. It is a ______ high-level data model.
ER model stands for an Entity-Relationship. It is a ______ high-level data model.
Component of ______ diagram
Component of ______ diagram
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Study Notes
ER Model Overview
- ER model stands for Entity-Relationship model
- It is a high-level data model
- It develops a conceptual design for the database
- It provides a simple and easy-to-design view of the database
ER Model Components
- Entity: represents a real-world object or concept, e.g. student, address
- Attributes: describe an entity, e.g. id, name, address, age
- Relationship: connection between entities, e.g. student has an address
ER Diagram
- A diagram that portrays the database structure
- Used to define the data elements and relationships for a specified database
- Represents entities, attributes, and relationships visually
Example: School Database
- Student is an entity with attributes like id, name, address, age
- Address is another entity with attributes like city, street name, pin code, etc.
- There is a relationship between student and address entities
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