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ushynnad
Starting Member

1 Posts
Posted - 10/25/2013 :  18:28:59  Show Profile  Reply with Quote
How it originally started: FIRE_REPORT(FireID, Alarms, Adddress, FiremanID, FiremanName, FiremanPhone, FiremanHomeStation, StationAddress, StationPhone, TruckID, LicensePlate)

The Assumptions:
1. each fire can have several firefighters assigned to it
2. each fire can have several fire trucks assigned to it
3. each firefighter can be assigned to several fires
4. each fire truck can be assigned to several fires
5. each firefighter has a single home station
6. each station name is unique
7. each station has a single phone number

FIRE_REPORT (FireID, FiremanID, TruckID)

(FireID, FiremanID, TruckID) -- (Alarms, Address, FiremanName, FiremanPhone, FiremanHomeStation, StationAddress, StationPhone, LicensePlate)

FiremanID -- (FiremanName, FiremanPhone, FiremanHomeStation, StationAddress, StationPhone)

FIREMAN (FiremanID, FiremanName, FiremanPhone, FiremanHomeStation)

FiremanID in FIRE_REPORT must exist in FiremanID in FIREMAN

FireID -- (Alarms, Address)

FIRE (FireID, Alarms, Address)

FireID in FIRE_REPORT must exist in FireID in FIRE

TruckID -- LicensePlate

TRUCK (TruckID, LicensePlate)

TruckID in FIRE_REPORT must exist in TruckID in TRUCK

FiremanHomeStation -- (StationAddress, StationPhone)

STATION (FiremanHomeStation, StationAddress, StationPhone)

FiremanHomeStation in FIREMAN must exist in FiremanHomeStation in STATION
Edited by - ushynnad on 10/25/2013 18:30:13

visakh16
Very Important crosS Applying yaK Herder

India
52326 Posts
Posted - 10/26/2013 :  00:55:45  Show Profile  Reply with Quote
I would have done it like this
FIRE_REPORT (FIREID,FIREMANID,TRUCKID)
FIRE (FIREID,Alarms,Adddress)
FIREMAN (FiremanID,FiremanName,FiremanPhone,FiremanHomeStationID)
STATION (StationID,Station,StationAddress,StationPhone)
TRUCK (TruckID,LicensePlate)

Relationships
FIRE_REPORT.FireID -> FIRE.FireID
FIRE_REPORT.FiremanID -> FIREMAN.FiremanID
FIRE_REPORT.TruckID -> TRUCK.TruckID
FIREMAN.FiremanHomeStationID -> STATION.StationID

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