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1Database design: ER diagramsINFO/COM S 230:Intermediate Web Design andProgrammingSection this Friday• First part will be given to meeting withyour final project team to talk aboutorganization and finding a client.• Second part will be given to letting youwork on Project 3 (and get help fromyour TA).• Attendance required (at least for theteam meeting).Database design• Starting today: how to go from clientrequirements to a good relational DBschema• Today and next time: Entity-Relationship (ER) diagrams• After that: NormalizationER diagramsER diagrams are a graphical means ofdisplayingrelationshipsbetweenentitysets(hence the name); both entity setsand relationships can haveattributes.Every DB text has a slightly different takeon ER diagrams; we’ll use a form from abook by Garcia-Molina, Ullman, andWidom (in the coursepack).Entity setsAnentityis an abstract object of somesort.Entity setsare a collection ofsimilar entities.E.g. Movies, StarsWe’ll draw these using rectangles.Easy PDF Creator is professional software to create PDF. If you wish to remove this line, buy it now.
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