project report for owen muzi, greenwich university ourseworks website , project reports

1. COURSEWORK BY OWEN .M. MUZI
ASSUMPTIONS (BUSINESS RULES)
 The owner of Female Avatar becomes the owner of child avatar (Mega) after breeding
 Players can sell or buy Avatars
 Avatar name can be derived from Avatar number


2. ENTITY RELATIONSHIP DIAGRAM (CHEN NOTATION)
1 N 1 N
N
1
Player Owns
Avatars Holds Weapons
O
Super
Seller Buyer
PlayerNo
AvatarNo PlayerNo WeaponNo
AvatarNo
Belongs
Species
Breeds
Mega
Metamorphose
Master
AvatarNo
AvatarNo
AvatarNo
SpeciesName
PlayerNo

3. LOGICAL RELATIONAL SCHEMA

4. NORMALISATION CHECK
“The Relational schema satisfies 3nf criteria”

5. SQL code
A1. SELECT players.emailaddress, avatars.dateofbirth, mega.fatherno, mega.motherno, avatars.lname
FROM (players inner join avatars on players.playerno = avatars.playerno) inner join mega on
avatars.avatarno = mega.superno
WHERE (((avatars.lname)=[ ]));
A2. SELECT players.emailaddress, avatars.lname, avatars.speciesname, master.*, master.leadershipskill,
super.wisdomlevel, avatars.dateofbirth
FROM (super inner join (players inner join avatars on players.playerno = avatars.playerno) on
super.avatarno = avatars.avatarno) inner join master on super.avatarno = master.masterno
WHERE (((avatars.dateofbirth) between [ ] and [ ]));
A3. SELECT avatars.lname, avatars.dateofbirth, avatars.strength, avatars.sex, avatars.hoard,
super.wisdomlevel, seller.sellerno, seller.playerno, seller.datesold, super.numberoftimessold
FROM (super inner join avatars on super.avatarno = avatars.avatarno) inner join seller on
(avatars.avatarno = seller.avatarno) and (super.avatarno = seller.avatarno)
WHERE (((super.numberoftimessold)>2));
A4. SELECT avatars.lname, weapons.lname, weapons.cost
FROM avatars inner join weapons on avatars.avatarno = weapons.avatarno;