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Chapter 2:  Entity-Relationship Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entity Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entity Sets  customer  and  loan customer-id  customer-  customer-  customer-  loan-  amount   name  street  city  number
Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Example:  customer = (customer-id, customer-name,    customer-street, customer-city) loan = (loan-number, amount)
Composite Attributes
Relationship Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Relationship Set  borrower
Relationship Sets (Cont.) ,[object Object],[object Object]
Degree of a Relationship Set ,[object Object],[object Object],[object Object],[object Object],[object Object]
Mapping Cardinalities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Mapping Cardinalities One to one One to many Note: Some elements in A and B may not be mapped to any  elements in the other set
Mapping Cardinalities  Many to one Many to many Note: Some elements in A and B may not be mapped to any  elements in the other set
Mapping Cardinalities affect ER Design ,[object Object],[object Object]
E-R Diagrams ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R Diagram With Composite, Multivalued, and Derived Attributes
Relationship Sets with Attributes
Roles ,[object Object],[object Object],[object Object],[object Object]
Cardinality Constraints ,[object Object],[object Object],[object Object],[object Object]
One-To-Many Relationship ,[object Object]
Many-To-One Relationships ,[object Object]
Many-To-Many Relationship ,[object Object],[object Object]
Participation of an Entity Set in a Relationship Set ,[object Object],[object Object],[object Object],[object Object],[object Object]
Alternative Notation for Cardinality Limits ,[object Object]
Keys ,[object Object],[object Object],[object Object],[object Object],[object Object]
Keys for Relationship Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R  Diagram with a Ternary Relationship
Cardinality Constraints on Ternary Relationship ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Binary Vs. Non-Binary Relationships ,[object Object],[object Object],[object Object],[object Object],[object Object]
Converting Non-Binary Relationships to Binary Form ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Converting Non-Binary Relationships (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Design Issues ,[object Object],[object Object],[object Object],[object Object]
How about doing an ER design interactively on the board? Suggest an application to be modeled.
Weak Entity Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Weak Entity Sets (Cont.) ,[object Object],[object Object],[object Object],[object Object]
Weak Entity Sets (Cont.) ,[object Object],[object Object]
More Weak Entity Set Examples ,[object Object],[object Object],[object Object],[object Object]
Specialization ,[object Object],[object Object],[object Object],[object Object]
Specialization Example
Generalization ,[object Object],[object Object],[object Object]
Specialization and Generalization (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Design Constraints on a Specialization/Generalization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Design Constraints on a Specialization/Generalization (Contd.) ,[object Object],[object Object],[object Object]
Aggregation ,[object Object],[object Object]
Aggregation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R Diagram With Aggregation
E-R Design Decisions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R Diagram for a Banking Enterprise
How about doing another ER design interactively on the board?
Summary of Symbols Used in E-R Notation
Summary of Symbols (Cont.)
Alternative E-R Notations
UML ,[object Object],[object Object],[object Object]
Summary of UML Class Diagram Notation
UML Class Diagrams (Contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
UML Class Diagram Notation (Cont.) * Note reversal of position in cardinality constraint depiction * Generalization can use merged or separate arrows independent of disjoint/overlapping overlapping disjoint
UML Class Diagrams (Contd.) ,[object Object],[object Object],[object Object],[object Object]
Reduction of an E-R Schema to Tables ,[object Object],[object Object],[object Object],[object Object],[object Object]
Representing Entity Sets as Tables ,[object Object]
Composite and Multivalued Attributes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Representing Weak Entity Sets ,[object Object]
Representing Relationship Sets as Tables ,[object Object],[object Object]
Redundancy of Tables ,[object Object],[object Object]
Redundancy of Tables (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Representing Specialization as Tables ,[object Object],[object Object],[object Object],[object Object]
Representing Specialization as Tables (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Relations Corresponding to Aggregation ,[object Object],[object Object],[object Object],[object Object]
Relations Corresponding to Aggregation (Cont.) ,[object Object],[object Object]
End of Chapter 2
E-R Diagram for Exercise 2.10
E-R Diagram for Exercise 2.15
E-R Diagram for Exercise 2.22
E-R Diagram for Exercise 2.15
Existence Dependencies ,[object Object],[object Object],[object Object],If a  loan  entity is deleted, then all its associated  payment  entities must be deleted also. loan-payment payment loan

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2. Entity Relationship Model in DBMS