Hostel Management System

Home Forums Computer Students Hostel Management System

Viewing 9 posts - 1 through 9 (of 9 total)
  • Author
    Posts
  • #2678
    admin
    Keymaster
    #2682
    admin
    Keymaster

    An entity relationship diagram (ERD), also known as an entity relationship model, is a graphical representation that depicts relationships among people, objects, places, concepts or events within an information technology (IT) system.

    #2683
    admin
    Keymaster

    ERD in SQL
    is a visual representation of the table’s structure and the relationships between logically related tables. In ER modeling the database structure is represented as a diagram known as ER diagram (ERD). An ER diagram gives a better understanding of the overall database structure.

    #2684
    admin
    Keymaster

    How does an ERD work?
    Image result wey dey for erd meaning
    An ERD visualizes the relationships between entities like people, things, or concepts in a database. An ERD will also often visualize the attributes of these entities. By defining the entities, their attributes, and showing the relationships between them, an ER diagram can illustrate the logical structure of databases.

    #2685
    admin
    Keymaster

    What are the 4 ERD rules?

    1.Provide a precise and appropriate name for each entity, attribute, and relationship in the diagram. …
    2.Remove vague, redundant or unnecessary relationships between entities.
    3.Never connect a relationship to another relationship.
    4.Make effective use of colors.

    #2686
    admin
    Keymaster

    Example ERD for Hostel Management System
    Entity Relationship Diagram

    • This reply was modified 3 months ago by admin.
    #2688
    admin
    Keymaster

    How do you ERD a database?

    1.Write a sentence or two about what you are storing data about.
    2.List what you’re storing data about – the nouns/objects.
    3.List the information you want to store for each object.
    4.Describe the relationships between each object.
    5.Draw the diagram.

    #2690
    admin
    Keymaster

    Entity Relationship Diagram Example 2
    Entity Relationship Diagram

    • This reply was modified 3 months ago by admin.
    #2693
    admin
    Keymaster

    Class diagrams are the blueprints of your system or subsystem. You can use class diagrams to model the objects that make up the system, to display the relationships between the objects, and to describe what those objects do and the services that they provide. Class diagrams are useful in many stages of system design.
    They are used to show the different objects in a system, their attributes, their operations, and the relationships among them. The following figure is an example of a simple class: Simple class diagram with attributes and operations.

    • This reply was modified 3 months ago by admin.
Viewing 9 posts - 1 through 9 (of 9 total)
  • You must be logged in to reply to this topic.
Scroll to Top