Recent Question/Assignment

Task A — ER Diagram
The local council is planning to implement a database system to help track players that sign
up to play soccer. Data needs to be maintained for each team, the players their parents.
Also, data needs to be stored for the coaches for each team.
Consider the following set of requirements to maintain this database:
A Team is made up of many Players, and also has a Coach, and each Player has a
Each Team has an ID number, name, and colours.
Each Player has an ID number, first name, last name, and age.
Each Coach has an ID number, first name, last name, and home phone number.
Each Parent has an ID number, last name, first name, Home phone number, and
Home Address (Street, City, State, and Postal Code).
A Player must have one and only one Team.
A Team must have many Players.
A Team may or may not have a Coach.
A Coach must have one and only one Team.
A Team may have many Coaches.
A Player must have at least one Parent, possibly more.
A Parent must have a Player.
According to the information above, draw a corresponding ER diagram. Please note:
A1. You may decide the names for entities, attributes and relations, but you should use
UPPERCASE to name your entities and use Capitalisation (of first letter) to name attributes
of entities.
A2. Underline all primary key attributes and mention all the foreign key attributes.
A3. Clearly indicate participation and cardinalities between entities. Also specify the
relationship verbs.
Task B — Normalization
Consider the following relation for student records:
GRAPEREPQRT(StudentIP, StudentName, StudentMajQL StudentStreetA4dress,
CpurseJ.p., CpurseJltle, CpurseCredjtPQjnts,
CpurseJ.nstrugtQflP, Jns.trugtQflP, JnstrugtprQffjge, Grade)
Given that the following functional dependencies exist:
- StudentName,,
- Grade
Instructor - Jns.trugMP, Jns.trugtprNgme, InstrugtprQffjge
Bl. Why is the relation in INF? State the reason(s).
B2. Is the relation in 2NF? State the reason for your answer with example.
B3. Decompose the relation to 3NF. State the reason(s) why the decomposed relation is in
Task C - SQL
Consider the following relational schema (the primary keys are underlined and foreign keys
are italic)
sname addressline1,addressline2, city, state, zip)
colour, description)
CATALOGUE Su lierlD PartslD cost, availability)
Write the SQL statements for the following queries:
Cl. List the PartslD's of all parts containing -plastid'.
C2. Find the names of suppliers who supply parts of red color and costing less than $200.
C3. What is the price of the lowest costing part in Melbourne?
C4. Find the suppliers who either supply some red part or who are in NSW.

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