Multiple models are utilized in software engineering to ease the programming or database design. One such model is the entity-relationship (ER) model/diagram, a data model used to represent the information or data aspects that are abstractly related to a business.
Peter Chen was the person behind the development of ER diagrams.
Levels of ER Models:
Three levels related ER diagrams include:
- Conceptual Data Model – It provides information on what will be part of a model set, making it the highest-level ER model.
- Logical Data Model – It is a detailed form of ER model that helps establish a relationship between data entities.
- Physical Data Model – The physical data model is highly detailed, allowing a database to be produced.
Benefits of ER Diagram:
The ER diagram is trendy as it carries multiple benefits, which include:
- Efficient communication: It allows the readers to understand the relationship among different fields effectively. Symbols are utilized to represent information effectively and help comprehend the working of the database.
- Visual representation: The data-flow diagrams and ER diagrams can effectively represent the layout visually.
- Easy understanding: Due to the ease of performance associated with a design using ER diagrams, it can be represented to the concerned people for confirmation. Also, changes can be made effectively based on the suggestions.
- Highly Flexible: The ER diagram can effectively establish and derive relationships from existing ones. Mathematical formulas and relational tables can be used for performing this operation.
Online ER Tools:
There are multiple tools available online related to the creation and editing of ER models, which include:
- Pony ORM allows users to generate database tables using Pony ORM and ER diagrams.
- Edra Soft – Helps in the creation of EM diagrams quickly.
- Draw – Helps in drawing flow charts, network and ER diagrams effectively.
- ERD Plus – It can create star and relational schemas along with ER diagrams.
- Lucidchart – Allows users to import database structure for effective process automation.
- ERDiagrams – They can be used to download ready-to-use ER diagrams free of cost.
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