G061 - Entity Relationship Diagrams

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Presentation transcript:

G061 - Entity Relationship Diagrams

Learning Objectives: By the end of this topic you should be able to: describe, interpret and create Entity Relationship Diagrams for a given scenario

Entity Relationship Diagrams an ERD represents the structure of data in a system relationships are the links between entities in a relational database an ERD shows the entities & the relationships between them

Library Database Members of a library are loaned books Entities: MEMBERS(MembersID, Forename, Surname, …..) BOOKS(BookID, ISBN, Title, Author, ….) LOANS(LoanID, MembersID, BookID, DateOut, …)

Library Database MEMBERS

Library Database MEMBERS LOANS

Library Database MEMBERS LOANS

Library Database MEMBERS LOANS BOOKS

Library Database MEMBERS LOANS BOOKS

Library Database MEMBERS MemberID LOANS LoanID BOOKS BookID

Library Database MEMBERS MemberID LOANS LoanID MemberID BOOKS BookID

Library Database MEMBERS LOANS BOOKS MemberID LoanID MemberID BookID

Library Database MEMBERS LOANS BOOKS MemberID Forename Surname PostCode LOANS LoanID MemberID BookID DateOut BOOKS BookID Title Author ISBN

Library Database MEMBERS LOANS BOOKS MemberID Forename Surname PostCode LOANS LoanID MemberID BookID DateOut BOOKS BookID Title Author ISBN MEMBERS(MemberID, Forename, Surname, PostCode) BOOKS(BookID, Title, Author, ISBN) LOANS(LoanID, MemberID, BookID, DateOut)