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Data Modeling Er

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Entity-Relationship Model

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Data Modeling : ER Model N. L. Sarda I.I.T. Bombay
Why We Model ,[object Object],[object Object],[object Object],[object Object]
Why We Model… ,[object Object],[object Object],[object Object]
How We Model ,[object Object],[object Object],[object Object],[object Object]
OUTLINE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DATA MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Model…… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Model…… ,[object Object],[object Object],[object Object],[object Object]
Example : Data Model in a PL ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example : Data Model in a PL … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ENTITY-RELATIONSHIP (ER) MODEL ,[object Object],[object Object],[object Object],[object Object]
ER MODEL…. ,[object Object],[object Object],[object Object],[object Object]
ENTITY ,[object Object],[object Object],[object Object],[object Object],[object Object]
ENTITY SET ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ENTITY SET…… ,[object Object],[object Object],[object Object],[object Object],[object Object]
ATTRIBUTE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ATTRIBUTE…. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ATTRIBUTE…. ,[object Object],[object Object],[object Object]
DOMAIN ,[object Object],[object Object],[object Object],[object Object],[object Object]
EXAMPLE : A COLLEGE ,[object Object],[object Object],[object Object],[object Object]
EXAMPLE : A COLLEGE… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP ,[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP SET ,[object Object],[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP SET…. ,[object Object],[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP SET…. ,[object Object],[object Object],[object Object],[object Object],[object Object]
DEPICTING A RELATIONSHIP ,[object Object],[object Object],[object Object]
 
RELATIONSHIP CARDINALITY ,[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP CARDINALITY… ,[object Object],[object Object],[object Object],[object Object]
RELATIONSHIP CARDINALITY… ,[object Object],[object Object],[object Object],[object Object],[object Object]
EXISTENCE DEPENDENCE ,[object Object],[object Object],[object Object]
EXISTENCE DEPENDENCE… ,[object Object],[object Object],[object Object]
 
 
E-R Diagram : Examples
[object Object],[object Object]
 
 
 
[object Object],[object Object],[object Object],[object Object]
TERNARY RELATIONSHIPS ,[object Object],[object Object],[object Object]
TERNARY RELATIONSHIPS… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
PRIMARY KEYS ,[object Object],[object Object],[object Object],[object Object]
PRIMARY KEYS….. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PRIMARY KEY FOR REPATIONSHIPS ,[object Object],[object Object]
WEAK ENTITY ,[object Object],[object Object],[object Object],[object Object]
WEAK ENTITY… ,[object Object],[object Object],[object Object],[object Object]
 
WEAK ENTITY… ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
EXERCISE (Post-Graduate studies) ,[object Object]
EXTENDED E-R MODEL ,[object Object],[object Object],[object Object]
Generalization ,[object Object],[object Object],[object Object]
Generalization… ,[object Object],[object Object]
 
Another example :
Specialization ,[object Object],[object Object],[object Object],[object Object]
Specialization….. ,[object Object],[object Object],[object Object]
 
Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object]
Aggregation ,[object Object],[object Object],[object Object],[object Object]
Examples : ,[object Object],[object Object],[object Object]
Raw Material Tools Worker Customer JobNo Quantity Work-order
(ANSWER TO EXERCISE)
Going from E-R to Relational Data Model Student rollno name … . Student ( ro llno, name, …. ) entity Need to match ER model concepts : entity, relationship, attribute with Relational model concepts : relation, attribute
E-R to Relational … Dept Mgr 1 1 DNo …… MName …… 1:1 DEPT ( DNo , ………. , MName ) MGR ( MName , ……, DNo ) also keys; in one or both
E-R to Relational … Bank Branch Client 1 m BName …… Name …… BKBranch ( BName , Loc , ………. ) Client ( Name , ……, BName , Loc , ACno ) Loc ACno The relationship is included in the entity on ‘many’ side; It includes primary key of entity on ‘one’ side and Relationship attributes, if any
E-R to Relational … Std Reg Course m m R# …… C# …… STD ( R# , ………. ) COURSE ( C# , …… ) REG (R# , C# , Grade) Grade
Exercise: Airport database ,[object Object],[object Object]
Airport database…. ,[object Object],[object Object],[object Object]
Exercises ,[object Object],[object Object],[object Object],[object Object],[object Object]
Exercises… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Exercise : Portfolio Management ,[object Object],[object Object],[object Object]
Portfolio … ,[object Object],[object Object],[object Object]
Portfolio … ,[object Object],[object Object],[object Object],[object Object]
QUALITY AND COMPLETENESS CHECKS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
QUALITY AND COMPLETENESS CHECKS… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
QUALITY AND COMPLETENESS CHECKS… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
QUALITY AND COMPLETENESS CHECKS… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Entity/Process Matrix ,[object Object],[object Object],[object Object]
Relationships between diagrams ,[object Object],[object Object],[object Object],[object Object],[object Object]
ENTITY LIFE HISTORY (ELH) ,[object Object],[object Object],[object Object],[object Object],[object Object]
ENTITY LIFE HISTORY (ELH).. ,[object Object]
ENTITY LIFE HISTORY (ELH).. ,[object Object],[object Object],[object Object]
ENTITY LIFE HISTORY (ELH).. ,[object Object],[object Object]
ENTITY LIFE HISTORY (ELH).. ,[object Object]
ENTITY LIFE HISTORY (ELH).. ,[object Object]

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Mehran University Newsletter Vol-X, Issue-I, 2024Mehran University Newsletter Vol-X, Issue-I, 2024
Mehran University Newsletter Vol-X, Issue-I, 2024
 

Data Modeling Er

  • 1. Data Modeling : ER Model N. L. Sarda I.I.T. Bombay
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  • 35. E-R Diagram : Examples
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  • 65. Raw Material Tools Worker Customer JobNo Quantity Work-order
  • 67. Going from E-R to Relational Data Model Student rollno name … . Student ( ro llno, name, …. ) entity Need to match ER model concepts : entity, relationship, attribute with Relational model concepts : relation, attribute
  • 68. E-R to Relational … Dept Mgr 1 1 DNo …… MName …… 1:1 DEPT ( DNo , ………. , MName ) MGR ( MName , ……, DNo ) also keys; in one or both
  • 69. E-R to Relational … Bank Branch Client 1 m BName …… Name …… BKBranch ( BName , Loc , ………. ) Client ( Name , ……, BName , Loc , ACno ) Loc ACno The relationship is included in the entity on ‘many’ side; It includes primary key of entity on ‘one’ side and Relationship attributes, if any
  • 70. E-R to Relational … Std Reg Course m m R# …… C# …… STD ( R# , ………. ) COURSE ( C# , …… ) REG (R# , C# , Grade) Grade
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