DDB5321 DATABASE SYSTEMS TUTORIAL 4 FOR D16A - TOPIC 5: Normalisation 1. What is Normalisation? 2. W

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DDB5321 DATABASE SYSTEMS

TUTORIAL 4

FOR D16A - TOPIC 5: Normalisation 1. What is Normalisation?  Evaluating and correcting table structures to minimize data redundancies and reduces data anomalies. Assigns attributes to tables based on determination 2. What is Denormalisation?  Produces a lower normal form. Results in increased performance and greater data redundancy 3. State the steps in each of the Normal Forms.  First Normal Form(1NF) i. Eliminate the repeating groups. ii. Identify the primary key. iii. Identify all dependencies.  Second Normal Form(2NF) - i. Make new tables to eliminate partial dependencies. ii. Reassign corresponding dependent attributes. 

Third Normal Form(3NF) - i. Make new tables to eliminate transitive dependencies. ii. Determinant: Any attribute whose value determines other values within a row.

4. Based on the following table, write the relational schema that meets 1NF, 2NF and 3NF requirements. You are also required to draw the dependency diagram for each normal form.

TABLE 1: STUDENT RECORDS SAMPLE ATTRIBUTE NAME

SAMPLE VALUE

SAMPLE VALUE

Student_Number

1051105286

1052003815

Student_Name Major Status Course_Number

Julia Roberts IT Active DCS5078 Database Systems 3 Robert FIST C+

Hans Isaac IT Active DCS5078 Database Systems 6 Robert FIST B

Course_Title Term Professor_Name Professor_Department Grade 

FIST

SAMPLE VALUE 105200520 0 Paul Walker ENG Active DTE6028 Networking 3 Weller FET F

SAMPLE VALUE 105112879 6 Julia Hana IT Active DBS5028 ECommerce 6 Shaari FBL B+

1NF STUDENT (Student_Number, Student_Name, Major, Status, Course_Number, Course_Title, Term, Professor_Name, Professor_Department, Grade)

1

DDB5321 DATABASE SYSTEMS

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TUTORIAL 4

2NF (Partial Dependency) STUDENT_Number -> Student_Name, Major, Status Course_Number -> Course_Title, Term, Professor_Name, Professor_Department Student_Number, Coure_Number -> Grade STUDENT (Student_Number, Student_Name, Major, Status) COURSE (Course_Number,Course_Title,Term,Professor_Name, Professor_Department) RESULT (Student_Number, Course_Number, Grade)



3NF (Transitive Dependency) Professor_Name -> Professor_Department STUDENT (Student_Number, Student_Name, Major, Status) COURSE (Course_Number, Course_Title,Term,ProfessorID) RESULT (Student_Number, Course_Number, Grade) PROFESSOR (ProfessorID, Professor_Name, Professor_Department)

5. Based on the following table, write the relational schema that meets 1NF, 2NF and 3NF requirements. You are also required to draw the dependency diagram for each normal form.

TABLE 2: FILM RECORDS SAMPLE



1NF FILM (Film_no, Film_Name, CinemaID, CinemaName, Location, ManagerID, Manager_Name, Takings)



2NF Film_no -> Film_Name CinemaID -> CinemaName, Location, ManagerID, Manager_Name Film_no, CinemaID -> Takings FILM (Film_no, Film_Name) CINEMA (CinemaID, CinemaName, Location, ManagerID, Manager_Name)

FIST

2

DDB5321 DATABASE SYSTEMS

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TUTORIAL 4

PROFIT/INCOME/ FILM_ CINEMA (Film_no, CinemaID, Takings) 3NF ManagerID -> Manager_Name FILM (Film_no, Film_Name) CINEMA (CinemaID, CinemaName, Location, ManagerID) PROFIT/INCOME/ FILM_ CINEMA (Film_no, CinemaID, Takings) MANAGER (ManagerID, Manager_Name)

6. Based on the following table, write the write the relational schema that meets 1NF, 2NF and 3NF requirements. You are also required to draw the dependency diagram for each normal form.

TABLE 3: STUDENT SPORT RECORDS SAMPLE



1NF STUDENT (Stud_No, Stud_Name, Sport_No, Sport_Name, Coach_No, Coach_Name, Trimester)



2NF PD Stud_No -> Stud_Name Sport_No -> Sport_Name, Coach_No, Coach_Name Stud_No, Sport_No -> Trimester STUDENT (Stud_No, Stud_Name) SPORT (Sport_No, Sport_Name, Coach_No, Coach_Name) STUDENT_SPORT (Stud_No, Sport_No, Trimester)

FIST

3

DDB5321 DATABASE SYSTEMS

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TUTORIAL 4

3NF TD Coach_No -> Coach_Name STUDENT (Stud_No, Stud_Name) SPORT (Sport_No, Sport_Name, Coach_No) STUDENT_SPORT (Stud_No, Sport_No, Trimester) COACH (Coach_No, Coach_Name)

7. Based on the following table, write the write the relational schema that meets 1NF, 2NF and 3NF requirements. You are also required to draw the dependency diagram for each normal form.

TABLE 4: SAMPLE DATA FOR CUSTOMERS AND PRODUCTS





1NF CUSTOMER (Cust_ID, Cust_Name, Cust_Phone, Product_ID, Product_Price, Staff_ID, Staff_Name, Date_Order, Qty)

Product_Name,

2NF Cust_ID -> Cust_Name, Cust_Phone, Staff_ID, Staff_Name) Product_ID -> Product_Name, Product_Price Cust_ID, Product_ID -> Date_Order, Qty CUSTOMER (Cust_ID, Cust_Name, Cust_Phone, Staff_ID, Staff_Name) PRODUCT (Product_ID, Product_Name, Product_Price) ORDER (Cust_ID, Product_ID, Date_Order, Qty)



3NF Staff_ID -> Staff_Name CUSTOMER (Cust_ID, Cust_Name, Cust_Phone, Staff_ID) PRODUCT (Product_ID, Product_Name, Product_Price) ORDER (Cust_ID, Product_ID, Date_Order, Qty) STAFF (Staff_ID, Staff_Name)

FIST

4

Submit Q8 and Q9 only

8. Based on the following table, write the write the relational schema that meets 1NF, 2NF and 3NF requirements. You are also required to draw the dependency diagram for each normal form.

TABLE 5: SAMPLE DATA FOR SALES REPORT

Note(Correction): Customer Number for Leno(M) Sdn Bhd at 5 th row is 18830. 

1NF SALESPERSON (SALESPERSON_NUMBER, SALESPERSON_NAME, SALES_AREA, CUSTOMER_NUMBER, CUSTOMER_NAME, WAREHOUSE_NUMBER, WAREHOUSE_LOCATION, SALES_AMOUNT)



2NF SALESPERSON (SALESPERSON_NUMBER, SALESPERSON_NAME, SALES_AREA) CUSTOMER (CUSTOMER_NUMBER, CUSTOMER_NAME, WAREHOUSE_NUMBER, WAREHOUSE_LOCATION) SALES (SALESPERSON_NUMBER, CUSTOMER_NUMBER, SALES_AMOUNT)



3NF SALESPERSON (SALESPERSON_NUMBER, SALESPERSON_NAME, SALES_AREA) CUSTOMER (CUSTOMER_NUMBER, CUSTOMER_NAME, WAREHOUSE_NUMBER) SALES (SALESPERSON_NUMBER, CUSTOMER_NUMBER, SALES_AMOUNT) WAREHOUSE (WAREHOUSE_NUMBER, WAREHOUSE_LOCATION)

9. Based on the following table, write the relational schema that meets 1NF, 2NF and 3NF requirements. You are required to draw the dependency diagram for each normal form.

TABLE 6: CUSTOMER-SHARE RECORDS SAMPLE



1NF Customer (CustID, CustName, BrokerID, BrokerName, CompanyNo, CompanyName, CompanyType, DateBought, Share, BoughtPrice, Dividend)



2NF Customer (CustID, CustName, BrokerID, BrokerName) Company (CompanyNo, CompanyName,CompanyType) Item (CustID, CompanyNO, DateBought, Share, BoughtPrice, Dividend)



3NF Customer (CustID, CustName, BrokerID) Broker (BrokeID, BrokerName) Company (CompanyNo, CompanyName, CompanyType) Item (CustID, CompanyNo, DateBought, Share, BoughtPrice, Dividend)