Jenny Jirathammakul Jenny Jirathammakul

High Distinction Assignment

31061 - Database Principles

Autumn, 2007

Melbourne City ToyotaMelbourne City Toyota

: Melbourne City Toyota

This database is based on the Melbourne City Toyota website: http://www.melbcitytoyota.com.au/default.cfm?fuseaction=usedcars.dsp_main

Allows users to search the website for New Toyotas, Used Cars or Demonstration Cars.

The Cars are sorted into Car Brands that is further arranged into the Car Style to make it easier to browse through the different categories.

Extras are also included, such as Accessories and Parts, with New Cars if the User wished to look through additional things for a particular car.

Enquiries by Users concerning the Cars are sorted by the CarID. This is to ensure that the Users’ enquiries would be specific to the particular car.

: Melbourne City Toyota

: Entity Relationship Diagram

: One to Many Relationship – 1:M

CarBrandID CarBrand CarModel CarMake CarBody

1 Toyota RAV4 CV 4WD

2 Toyota Camry Sportivo Sedan

6 Honda Accord EXI 4WS Sedan

8 Lexus IS200 Sports Sedan

11 Suzuki Swift Cino Hatchback

CarID CarBrandID* CarYear CarOwnType Colour Kilometres ListPrice InternetPrice Registration

N12345 1 2007 New Silver 31990

U36892 1 2006 Used Light Gold 75324 32990 27777 ULS948

U37771 1 2006 Used Light Teal 7499 35990 33777 UPZ685

N24689 2 2007 Used Black 33000

U36901 2 2004 Used White 144064 22990 21540 ULJ121

Primary Key

Foreign Key*

This 1:M relationship shows that one Car Style has one or many cars with that style CarBrandID 1 & 2 show this association

CarStyle

Car

: Many to Many Relationship – M:M

CarID CarBrandID* CarYear CarOwnType Colour Kilometres ListPrice InternetPrice Registration

N12345 1 2007 New Silver 31990

U36892 1 2006 Used Light Gold 75324 32990 27777 ULS948

U37771 1 2006 Used Light Teal 7499 35990 33777 UPZ685

N24689 2 2007 New Black 33000

U36901 2 2004 Used White 144064 22990 21540 ULJ121

CarID* AccessoryID* PartsID*

N12345 1 1

N12345 2 0

N24689 9 2

N24689 13 0

N24689 14 0

N54321 14 1

AccessoryID AccessoryName AccessoryPrice

1 Safety Pack 750

2 Metallic Paint 300

9 New Camry Bootlip Spoilers 550

13 Leather Trim 1500

14 Moonroof 1650Car

Extras

Accessory

This M:M relationship shows that many cars can have many accessories because:

A Car can have many Accessories and; An Accessory can be apart of many Cars

: Simple Query of a Single Table

CarBrandID CarBrand CarModel CarMake CarBody

6 Honda Accord EXI 4WS Sedan

7 Honda HRV Sport 4WD

select * from carstyle where carbrand = ‘Honda’ order by carbrandid;

List all cars manufactured by Honda

select accessoryname, accessoryprice from accessory where accessoryname like ‘G%’;

Show all Accessory Names starting with ‘G’

AccessoryName AccessoryPrice

Genuine Toyota Park Assist 595

Genuine Toyota Protection Packs 180

Genuine Toyota Satellite Navagation System 3500

: Query – Natural Join

select enquiriesid, carid, username, carowntype, question from users natural join enquiries natural join car where carid = ‘U37975’;

Show EnquiriesID, CarID, UserName, CarOwnType and Question for the car ‘U37975’

EnquiriesID CarID UserName CarOwnType Question

3 U37975 Nicole UsedWould the car get the same kind of since as a newly bought

Toyota since it has only been used for a while

1 U37975 Tony Used What is the average Fuel consumption rate for this car

: Cross-Product Join

select carid, carbrand, carmodel, carmake, caryear from car, carstyle where car.carbrandid = carstyle.carbrandid and carbody = ‘Hatchback’;

Show the carid, carbrand, carmodel and carmake, caryear of all cars that are hatchbacks

CarID CarBrand CarModel CarMake CarYear

N12345 Suzuki Swift Cino 1998

U36892 Toyota Yaris YR 2007

: Group By

Find out how many CarBrandIDs have registrations (that is, their registration is not null)

select carbrandid, count(*) from car where registration is not null group by carbrandid;

CarBrandID Count

14 2

13 1

11 1

10 1

9 1

8 1

7 1

6 1

5 1

2 1

1 2

: Group By with Having

Display car colours that have more than one car having that colour

select colour, count(*) as total from car group by colour having count(*) > 1;

Colour Total

Silver 3

Black 3

White 4

: Sub-Query

List the carid, carbrand, carmodel, carmake, kilometres of the car with the minimum amount of kilometres driven that was manufactured before the year 2000

select carid, carbrand, carmodel, carmake, kilometres from car natural join carstyle where caryear < 2000 and kilometres <= (select min(kilometres) from car where caryear < 2000);

CarID CarBrand CarModel CarMake Kilometres

U38412 Suzuki Swift Cino 95876

: Self-Join

List the CarID of cars that have the same colour ‘Black’

select c1.colour, c2.carid from car c1, car c2 where c1.carid = ‘U38523’ and c1.colour = c2.colour;

Colour CarID

Black N24689

Black U38523

Black U37947

: Data Integrity – CHECK Statements

These CHECK statements make sure that the values entered into the INSERT statements do not breach the restrictions placed upon them

CONSTRAINTCONSTRAINT Car_Year CHECKCHECK ((CarYear > 1900) AND (CarYear <= 2007)),CONSTRAINTCONSTRAINT Car_ListPrice CHECKCHECK (ListPrice > 0),CONSTRAINTCONSTRAINT Car_InternetPrice CHECKCHECK ((InternetPrice > 0) OR (InternetPrice IS NULL))

This CHECK statements make sure that the values entered into the INSERT statements include only these types of values, that is, the only values that can be entered into Car Brand are only those types of car brands to ensure that misspellings do not occur

CONSTRAINTCONSTRAINT CarStyle_Brand CHECKCHECK (CarBrand IN ( 'Alfa Romeo','Audi','BMW','Chrysler','Citroen', 'Daewoo','Daihatsu','Ford','Holden','Honda', 'Hyundai','Isuzu','Jeep','Land Rover','Lexus', 'Mazda','Mercedes-Benz','Mitsubishi','Nissan', 'Peugeot','Proton','Renault','Saab','Smart', 'Subaru','Suzuki','Toyota','Volkswagen','Volvo'))

Check Statements prevents the SQL from creating data that does not conform to the guidelines that have been put into place and an error would thus occur because of a breach of the contraints

: Action Statements – ON DELETE RESTRICT

“ON DELETE RESTRICT” prevents the deletion of data that is being used by other categories in another table

These Restrictions prevent the deletion of AccessoryIDs and PartsIDs if they are currently being used by other categories in another table

CONSTRAINT ExtrasFK_aid FOREIGN KEY (AccessoryID) REFERENCES Accessory (AccessoryID) ON DELETE RESTRICTON DELETE RESTRICT ON UPDATE CASCADE,

CONSTRAINT ExtrasFK_pid FOREIGN KEY (PartsID) REFERENCES Parts (PartsID) ON DELETE RESTRICTON DELETE RESTRICT ON UPDATE CASCADE

: Action Statements – ON DELETE CASCADE

“ON DELETE CASCADE” allows data to be deleted from a table that will delete itself in another table as well

This deletion of CarID in a table will also be deleted in the extras table also

CONSTRAINT ExtrasFK_cid FOREIGN KEY (CarID) REFERENCES Car (CarID) ON DELETE CASCADEON DELETE CASCADE ON UPDATE CASCADE,

: Creating a View

create view specs (carid, year, brand, model, make, kms, owntype, rego)as select carid, caryear, carbrand, carmodel, carmake, kilometres, carowntype, registrationfrom car, carstylewhere car.carbrandid = carstyle.carbrandidand carbody = ‘4WD’;

Create a view that shows the car style , year, kilometres, ownership type and registration of 4WDs

select * from specs;

CarID Year Brand Model Make Kms OwnType Rego

N12345 2007 Toyota RAV4 CV New

U37975 2004 Ford Territory TS 47088 Used SZS937

U38601 1999 Honda HRV Sport 123000 Used PUR303

U36892 2006 Toyota RAV4 CV 75324 Used ULS948

U37771 2006 Toyota RAV4 CV 7499 Used UPZ685

: Querying a View

select * from specs where brand <>‘Toyota’;

Show all 4WDs that are not Toyota from the created view ‘specs’

CarID Year Brand Model Make Kms OwnType Rego

U37975 2004 Ford Territory TS 47088 Used SZS937

U38601 1999 Honda HRV Sport 123000 Used PUR303