# COMP2350 Computing| Relations are in BCNF

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### COMP2350 Computing

Identify the nontrivial FDs on the relation Abnormal_Rel. Then identify the Candidate

key(s) of Abnormal_Rel.

Determine for each update anomaly whether or not the relation Abnormal_Rel is

susceptible to that anomaly. Support your determination with adequate explanation and a

small example.

Determine the highest normal form that the relation Abnormal_Rel is in. Then:

1. Normalize/decompose it until you get relations that are in 3NF. Use appropriate

illustration to aid the understanding of your work.

2. Check if the resultant relations are in BCNF. If not, decompose them as necessary

until you get all of them in BCNF.

Now (at the end of completing Task 3) you have a set of relation(s) in BCNF, derived from

the relation Abnormal_Rel.

1. Create an appropriate table for each of these relations (in BCNF), keeping the key

constraints in mind. Copy and paste into your .doc document the SQL code you used

for this purpose. Also paste into your Assignment2Code text file the same.

2. Insert five rows of (madeup) data into each table. Make sure that the data you enter

in these tables should be sufficient to return at least one row for each query in Task

5. For instance, MA should hold at least 5 bottles of Penfold Grange 2010 in some

branch or other. Copy and paste into your .doc document the SQL code you used for

this purpose. Also paste into your Assignment2Code text file the same.

3. Display the content of each table using a SELECT * query. Copy and paste into your

.doc document the result that was displayed. COMP2350/6350 2021 Assignment 2

4

Write SQL queries to answer the following four questions (Q1Q4). With respect to

each,

Copy and paste into your .doc document the SQL query you used for this

purpose. Also paste into your Assignment2Code text file the same.

Display the result of running this query. Copy and paste into your .doc

document the result that was displayed.

[Query 1] List the branches (ID) of MA that have in stock at least 5 bottles of Penfold

Grange 2010.

[Query 2] Simone Singh plans to do some lastminute Christmas shopping on

24/12/2021. List details of each beer that she will be entitled to get 20% discount on.

[Query 3] Generate a list of all email addresses of members whose card will expire in

the month after the coming month. Thus, for instance, if the query is run in November

2121, it will list the emails of all members whose membership will expire in January

2122. The emails should be ordered by Branch ID, then by expiry date, and then by

the email address, all in ascending order.

[Query 4] Determine how many times Penfold Grange 2010 has gone on sale since

Covid19 related lockdown started

### COMP2350 Computing

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