Design Algorithm Essentials 1.Combine functional edges with the same tail object set(s) into a scheme. (The tail object set(s) and any others in a 1-1.

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Presentation transcript:

Design Algorithm Essentials 1.Combine functional edges with the same tail object set(s) into a scheme. (The tail object set(s) and any others in a 1-1 correspondence are keys.) 2.Each nonfunctional edge is a scheme. (All object sets constitute the key.) 3. Each stand-alone object set is a scheme. (The lone object set is a key.) A B C A B C A B C AA ABA B A B C A B C A B C A B C D D A B C D

B&B Example – Canonical

B&B Example – Generated Database Scheme Room(RoomNr, RoomName, NrBeds, Cost) Guest(GuestNr, GuestName, StreetNr, City) Reservation(GuestNr, RoomNr, ArrivalDate, NrDays) Room[RoomNr]  Reservation[RoomNr] Guest[GuestNr] = Reservation[GuestNr]

B&B Example – ORM Diagram

B&B Example – ORM Hypergraph

B&B Example – Congruent

B&B Example – Canonical

B&B Example – Generated Database Scheme Room(RoomNr, RoomName, NrBeds, Cost) Guest(GuestNr, GuestName, StreetNr, City) Reservation(GuestNr, RoomNr, ArrivalDate, NrDays) Room[RoomNr]  Reservation[RoomNr] Guest[GuestNr] = Reservation[GuestNr]