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Entity-Relationship Diagram




    Conceptual Data Model)

                     E-R

Strong entity



Weak entity



Associative entity*

Single-valued attribute



Multi valued attribute



Derived attribute
Simple Attribute



Composite Attribute

Relationship



Identifying Relationship
Unary

               entity instance
 entity type
Binary

               entity instance   2
 entity type
Ternary

               entity instance   3
 entity type





     Cardinality Constraints
     Participation Constraints

                                    3
    
        One-to-one relationship
    
        One-to-many relationship
    
        many-to-many relationship
   One-to-one relationship




               1              1
   One-to-many relationship




              1                M
   many-to-many relationship




              M                 N

     Total Participation (                   )
     Partial Participation (                     )

    Total Participation         Partial Participation


                  M               N










       Entity Relationship Diagram
    Primary key

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E r diagram