SlideShare una empresa de Scribd logo
1 de 23
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]

Más contenido relacionado

La actualidad más candente

La actualidad más candente (20)

Entity Relationship Diagram
Entity Relationship DiagramEntity Relationship Diagram
Entity Relationship Diagram
 
Physical database design(database)
Physical database design(database)Physical database design(database)
Physical database design(database)
 
Schema
SchemaSchema
Schema
 
Types of Database Models
Types of Database ModelsTypes of Database Models
Types of Database Models
 
Dbms architecture
Dbms architectureDbms architecture
Dbms architecture
 
data modeling and models
data modeling and modelsdata modeling and models
data modeling and models
 
ER MODEL
ER MODELER MODEL
ER MODEL
 
Ppt of dbms e r features
Ppt of dbms e r featuresPpt of dbms e r features
Ppt of dbms e r features
 
Entity Relationship Model
Entity Relationship ModelEntity Relationship Model
Entity Relationship Model
 
ER DIAGRAM & ER MODELING IN DBMS
ER DIAGRAM & ER MODELING IN DBMSER DIAGRAM & ER MODELING IN DBMS
ER DIAGRAM & ER MODELING IN DBMS
 
DBMS Keys
DBMS KeysDBMS Keys
DBMS Keys
 
Relational model
Relational modelRelational model
Relational model
 
Rdbms
RdbmsRdbms
Rdbms
 
Object Oriented Dbms
Object Oriented DbmsObject Oriented Dbms
Object Oriented Dbms
 
All data models in dbms
All data models in dbmsAll data models in dbms
All data models in dbms
 
Entity (types, attibute types)
Entity (types, attibute types)Entity (types, attibute types)
Entity (types, attibute types)
 
Databases: Normalisation
Databases: NormalisationDatabases: Normalisation
Databases: Normalisation
 
Entity Relationship Diagram
Entity Relationship DiagramEntity Relationship Diagram
Entity Relationship Diagram
 
Entities and attributes
Entities and attributesEntities and attributes
Entities and attributes
 
Dbms models
Dbms modelsDbms models
Dbms models
 

Similar a Entity relationship modelling

Similar a Entity relationship modelling (20)

Data base lec3 (erd)
Data base lec3 (erd)Data base lec3 (erd)
Data base lec3 (erd)
 
dbms mannual.pdf
dbms mannual.pdfdbms mannual.pdf
dbms mannual.pdf
 
Er Modeling
Er ModelingEr Modeling
Er Modeling
 
Er diagrams
Er diagramsEr diagrams
Er diagrams
 
5e7ry754.pptx
5e7ry754.pptx5e7ry754.pptx
5e7ry754.pptx
 
Entity Relationship Modelling
Entity Relationship ModellingEntity Relationship Modelling
Entity Relationship Modelling
 
Data Modeling Er
Data Modeling ErData Modeling Er
Data Modeling Er
 
Er model
Er modelEr model
Er model
 
Database part3-
Database part3-Database part3-
Database part3-
 
E_R-Diagram (2).pptx
E_R-Diagram (2).pptxE_R-Diagram (2).pptx
E_R-Diagram (2).pptx
 
ER Diagram- Cardinality.pptx
ER Diagram- Cardinality.pptxER Diagram- Cardinality.pptx
ER Diagram- Cardinality.pptx
 
Entity Relationship Diagram part9
Entity Relationship Diagram part9Entity Relationship Diagram part9
Entity Relationship Diagram part9
 
Design issues with constraints of E-R model
Design issues with constraints of E-R modelDesign issues with constraints of E-R model
Design issues with constraints of E-R model
 
Entity Relationship Model
Entity Relationship ModelEntity Relationship Model
Entity Relationship Model
 
Data modeling
Data modelingData modeling
Data modeling
 
Introduction of Database Design and Development
Introduction of Database Design and DevelopmentIntroduction of Database Design and Development
Introduction of Database Design and Development
 
Introduction to ER Diagrams
Introduction to ER DiagramsIntroduction to ER Diagrams
Introduction to ER Diagrams
 
DBMS Unit-2_Final.pptx
DBMS Unit-2_Final.pptxDBMS Unit-2_Final.pptx
DBMS Unit-2_Final.pptx
 
Entity Relationship Diagram – ER Diagram in DBMS.pptx
Entity Relationship Diagram – ER Diagram in DBMS.pptxEntity Relationship Diagram – ER Diagram in DBMS.pptx
Entity Relationship Diagram – ER Diagram in DBMS.pptx
 
ECEG 4702-Class7-Entity-Relationship modeling.pptx
ECEG 4702-Class7-Entity-Relationship modeling.pptxECEG 4702-Class7-Entity-Relationship modeling.pptx
ECEG 4702-Class7-Entity-Relationship modeling.pptx
 

Más de Dr. C.V. Suresh Babu (20)

Data analytics with R
Data analytics with RData analytics with R
Data analytics with R
 
Association rules
Association rulesAssociation rules
Association rules
 
Clustering
ClusteringClustering
Clustering
 
Classification
ClassificationClassification
Classification
 
Blue property assumptions.
Blue property assumptions.Blue property assumptions.
Blue property assumptions.
 
Introduction to regression
Introduction to regressionIntroduction to regression
Introduction to regression
 
DART
DARTDART
DART
 
Mycin
MycinMycin
Mycin
 
Expert systems
Expert systemsExpert systems
Expert systems
 
Dempster shafer theory
Dempster shafer theoryDempster shafer theory
Dempster shafer theory
 
Bayes network
Bayes networkBayes network
Bayes network
 
Bayes' theorem
Bayes' theoremBayes' theorem
Bayes' theorem
 
Knowledge based agents
Knowledge based agentsKnowledge based agents
Knowledge based agents
 
Rule based system
Rule based systemRule based system
Rule based system
 
Formal Logic in AI
Formal Logic in AIFormal Logic in AI
Formal Logic in AI
 
Production based system
Production based systemProduction based system
Production based system
 
Game playing in AI
Game playing in AIGame playing in AI
Game playing in AI
 
Diagnosis test of diabetics and hypertension by AI
Diagnosis test of diabetics and hypertension by AIDiagnosis test of diabetics and hypertension by AI
Diagnosis test of diabetics and hypertension by AI
 
A study on “impact of artificial intelligence in covid19 diagnosis”
A study on “impact of artificial intelligence in covid19 diagnosis”A study on “impact of artificial intelligence in covid19 diagnosis”
A study on “impact of artificial intelligence in covid19 diagnosis”
 
A study on “impact of artificial intelligence in covid19 diagnosis”
A study on “impact of artificial intelligence in covid19 diagnosis”A study on “impact of artificial intelligence in covid19 diagnosis”
A study on “impact of artificial intelligence in covid19 diagnosis”
 

Último

Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17Celine George
 
Difference Between Search & Browse Methods in Odoo 17
Difference Between Search & Browse Methods in Odoo 17Difference Between Search & Browse Methods in Odoo 17
Difference Between Search & Browse Methods in Odoo 17Celine George
 
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdf
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdfLike-prefer-love -hate+verb+ing & silent letters & citizenship text.pdf
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdfMr Bounab Samir
 
Judging the Relevance and worth of ideas part 2.pptx
Judging the Relevance  and worth of ideas part 2.pptxJudging the Relevance  and worth of ideas part 2.pptx
Judging the Relevance and worth of ideas part 2.pptxSherlyMaeNeri
 
Barangay Council for the Protection of Children (BCPC) Orientation.pptx
Barangay Council for the Protection of Children (BCPC) Orientation.pptxBarangay Council for the Protection of Children (BCPC) Orientation.pptx
Barangay Council for the Protection of Children (BCPC) Orientation.pptxCarlos105
 
Keynote by Prof. Wurzer at Nordex about IP-design
Keynote by Prof. Wurzer at Nordex about IP-designKeynote by Prof. Wurzer at Nordex about IP-design
Keynote by Prof. Wurzer at Nordex about IP-designMIPLM
 
Proudly South Africa powerpoint Thorisha.pptx
Proudly South Africa powerpoint Thorisha.pptxProudly South Africa powerpoint Thorisha.pptx
Proudly South Africa powerpoint Thorisha.pptxthorishapillay1
 
How to Add Barcode on PDF Report in Odoo 17
How to Add Barcode on PDF Report in Odoo 17How to Add Barcode on PDF Report in Odoo 17
How to Add Barcode on PDF Report in Odoo 17Celine George
 
Science 7 Quarter 4 Module 2: Natural Resources.pptx
Science 7 Quarter 4 Module 2: Natural Resources.pptxScience 7 Quarter 4 Module 2: Natural Resources.pptx
Science 7 Quarter 4 Module 2: Natural Resources.pptxMaryGraceBautista27
 
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdf
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdfInclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdf
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdfTechSoup
 
Computed Fields and api Depends in the Odoo 17
Computed Fields and api Depends in the Odoo 17Computed Fields and api Depends in the Odoo 17
Computed Fields and api Depends in the Odoo 17Celine George
 
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptx
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptxINTRODUCTION TO CATHOLIC CHRISTOLOGY.pptx
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptxHumphrey A Beña
 
ACC 2024 Chronicles. Cardiology. Exam.pdf
ACC 2024 Chronicles. Cardiology. Exam.pdfACC 2024 Chronicles. Cardiology. Exam.pdf
ACC 2024 Chronicles. Cardiology. Exam.pdfSpandanaRallapalli
 
DATA STRUCTURE AND ALGORITHM for beginners
DATA STRUCTURE AND ALGORITHM for beginnersDATA STRUCTURE AND ALGORITHM for beginners
DATA STRUCTURE AND ALGORITHM for beginnersSabitha Banu
 
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️9953056974 Low Rate Call Girls In Saket, Delhi NCR
 
Choosing the Right CBSE School A Comprehensive Guide for Parents
Choosing the Right CBSE School A Comprehensive Guide for ParentsChoosing the Right CBSE School A Comprehensive Guide for Parents
Choosing the Right CBSE School A Comprehensive Guide for Parentsnavabharathschool99
 
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...Postal Advocate Inc.
 

Último (20)

Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
Incoming and Outgoing Shipments in 3 STEPS Using Odoo 17
 
Difference Between Search & Browse Methods in Odoo 17
Difference Between Search & Browse Methods in Odoo 17Difference Between Search & Browse Methods in Odoo 17
Difference Between Search & Browse Methods in Odoo 17
 
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdf
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdfLike-prefer-love -hate+verb+ing & silent letters & citizenship text.pdf
Like-prefer-love -hate+verb+ing & silent letters & citizenship text.pdf
 
Judging the Relevance and worth of ideas part 2.pptx
Judging the Relevance  and worth of ideas part 2.pptxJudging the Relevance  and worth of ideas part 2.pptx
Judging the Relevance and worth of ideas part 2.pptx
 
Barangay Council for the Protection of Children (BCPC) Orientation.pptx
Barangay Council for the Protection of Children (BCPC) Orientation.pptxBarangay Council for the Protection of Children (BCPC) Orientation.pptx
Barangay Council for the Protection of Children (BCPC) Orientation.pptx
 
Keynote by Prof. Wurzer at Nordex about IP-design
Keynote by Prof. Wurzer at Nordex about IP-designKeynote by Prof. Wurzer at Nordex about IP-design
Keynote by Prof. Wurzer at Nordex about IP-design
 
Proudly South Africa powerpoint Thorisha.pptx
Proudly South Africa powerpoint Thorisha.pptxProudly South Africa powerpoint Thorisha.pptx
Proudly South Africa powerpoint Thorisha.pptx
 
LEFT_ON_C'N_ PRELIMS_EL_DORADO_2024.pptx
LEFT_ON_C'N_ PRELIMS_EL_DORADO_2024.pptxLEFT_ON_C'N_ PRELIMS_EL_DORADO_2024.pptx
LEFT_ON_C'N_ PRELIMS_EL_DORADO_2024.pptx
 
How to Add Barcode on PDF Report in Odoo 17
How to Add Barcode on PDF Report in Odoo 17How to Add Barcode on PDF Report in Odoo 17
How to Add Barcode on PDF Report in Odoo 17
 
Science 7 Quarter 4 Module 2: Natural Resources.pptx
Science 7 Quarter 4 Module 2: Natural Resources.pptxScience 7 Quarter 4 Module 2: Natural Resources.pptx
Science 7 Quarter 4 Module 2: Natural Resources.pptx
 
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdf
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdfInclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdf
Inclusivity Essentials_ Creating Accessible Websites for Nonprofits .pdf
 
YOUVE GOT EMAIL_FINALS_EL_DORADO_2024.pptx
YOUVE GOT EMAIL_FINALS_EL_DORADO_2024.pptxYOUVE GOT EMAIL_FINALS_EL_DORADO_2024.pptx
YOUVE GOT EMAIL_FINALS_EL_DORADO_2024.pptx
 
Computed Fields and api Depends in the Odoo 17
Computed Fields and api Depends in the Odoo 17Computed Fields and api Depends in the Odoo 17
Computed Fields and api Depends in the Odoo 17
 
TataKelola dan KamSiber Kecerdasan Buatan v022.pdf
TataKelola dan KamSiber Kecerdasan Buatan v022.pdfTataKelola dan KamSiber Kecerdasan Buatan v022.pdf
TataKelola dan KamSiber Kecerdasan Buatan v022.pdf
 
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptx
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptxINTRODUCTION TO CATHOLIC CHRISTOLOGY.pptx
INTRODUCTION TO CATHOLIC CHRISTOLOGY.pptx
 
ACC 2024 Chronicles. Cardiology. Exam.pdf
ACC 2024 Chronicles. Cardiology. Exam.pdfACC 2024 Chronicles. Cardiology. Exam.pdf
ACC 2024 Chronicles. Cardiology. Exam.pdf
 
DATA STRUCTURE AND ALGORITHM for beginners
DATA STRUCTURE AND ALGORITHM for beginnersDATA STRUCTURE AND ALGORITHM for beginners
DATA STRUCTURE AND ALGORITHM for beginners
 
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️
call girls in Kamla Market (DELHI) 🔝 >༒9953330565🔝 genuine Escort Service 🔝✔️✔️
 
Choosing the Right CBSE School A Comprehensive Guide for Parents
Choosing the Right CBSE School A Comprehensive Guide for ParentsChoosing the Right CBSE School A Comprehensive Guide for Parents
Choosing the Right CBSE School A Comprehensive Guide for Parents
 
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...
USPS® Forced Meter Migration - How to Know if Your Postage Meter Will Soon be...
 

Entity relationship modelling