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Entity relationship modelling

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Dr. C.V. Suresh Babu
Dr. C.V. Suresh Babu
BildungTechnologieGesundheit & Medizin
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Relational Database Lecture 2: Entity-Relationship Modelling
Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object]
Recap ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entity-Relationship Modelling ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entities and Entity-types ,[object Object],[object Object],[object Object],Lecture This lecture Lecturer Me Student You Entity-type Entity
E-R Diagram ,[object Object],Student Lecture Lecturer
Relationships and Relationship-types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R Diagram ,[object Object],Student Lecture Lecturer E-R depiction of entity-types and their relationship-types gives attends
Relationship-type Degree ,[object Object],[object Object],[object Object],[object Object]
E-R Diagram ,[object Object],Student Lecture Lecturer E-R diagram extended to show relationship degrees. gives attends M 1 M N
Participation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
E-R Diagram ,[object Object],Student Lecture Lecturer E-R diagram extended to show relationship degrees. gives attends M 1 M N
Attributes ,[object Object],[object Object],Lecture time date length place
Dealing with multi-valued attributes ,[object Object],Lecture time date length Lecture theatre Takes place in M N
E-R Diagram Student Lecture Lecturer E-R Diagram for student-lecture-lecturer attends gives M N 1 M surname forenames title surname forenames title time date length place Reg_no
Attribute or Entity-type? ,[object Object],[object Object],[object Object]
Promotion from attribute to entity-type I Lecture time date module length
Promotion from attribute to entity-type I Lecture time date length Belongs to Module code title credits M 1
Promotion from attribute to entity-type I Lecture time date objectives length
Promotion from attribute to entity-type I Lecture time date length Addresses Objectives description M N
Determining components of an E-R Diagram ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example UoD ,[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Entity relationship modelling