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Umar Erd
 

Umar Erd

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Entity Relationship Diagram

Entity Relationship Diagram

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    Umar Erd Umar Erd Presentation Transcript

    • Entity Relationship Diagram Presented by: Muhammad umer Bs(cs) 4th (b)
    • Entity relationship diagram * In 1976 Peter Chen was developed ERD * Introduce by Charles Bachman * A Graphical Representation * A Semantic Data model
    • COMPONENTS OF ERD * Data objects * Data attributes * Relationship
    • TYPES OF RELATIONSHIP * One to One * One to Many * Many to Many
    • ONE TO ONE ROOF COVERS COVERD BY BUILDING
    • ONE TO MANY EMPLOYEE WORK IN HAS DEPARTMENT
    • MANY TO MANY EQUIPMENT ALLOCATED TO ALLOCATED PROJECT
    • CARDINALITY & MODALITY * Cardinality: Express the maximum number of relationships * Modality: Express whether the relationships is optional or mandatory
    • THANK YOU