1. No category

CISC437/637, Fall 2014
CISC437/637, Database Systems
HW #3
Due October 14 2014, 2:00pm, In Class ; Note: NO LATE SUBMISSION!
1. DSC Textbook, P. 105, 3.1 a-e.
(CISC 437: 20% CISC 637: 15%)
(Wherever the question says “Autumn” it should be “Fall”.)
NOTE: You are not required to run the queries using MySQL.
If you would like to try and run them, you can use the database data provided at:
http://codex.cs.yale.edu/avi/db-book/db6/lab-dir/sample_tables-dir/index.html
To run MySQL you need to log into the machine:
cisc437.acad.cis.udel.edu
for which you should already have an account and a password.
To start MySQL use the command:
mysql -u userid -p
(use your own userid, which you have received)
This will prompt you for a password, which again, you should have received by now.
2. DSC Textbook, P. 108, 3.11
CISC 437: a-c; CISC 637: a-d
(15%)
3. DSC Textbook, P. 109, 3.12 a-e
(CISC 437: 20%, CISC 637: 15%)
(Wherever the question says “Autumn” it should be “Fall”.)
4. DSC Textbook, P. 109, 3.13
(15%)
5. DSC Textbook, P. 155, 4.12
(15%.)
Hint: For writing the query with no outer join, use a nested, subquery structure as
shown in the examples in class.
6. (15%)
Consider the following relation instance with attributes A,B,C :
A
a1
a1
a1
a1
B
b1
b1
b2
b2
© Hagit Shatkay, 2014
C
c1
c2
c1
c3
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For each of the following functional dependecies say whether it is imposed (as far as
you can tell based on the available instances) – or violated – by the relational schema.
Provide a short (no longer than 2 lines!) justification for each answer.
a. AgB
b. AgC
c. BgA
d. CgA
e. CgAB
f. BCgA
CISC637 only
7. DSC Textbook, P. 155, 4.13.
(10%)
The question refers to the university database schema that is displayed in Chapter 2,
page 48, Figure 2.9 and is later translated into a full SQL declerations in Chapters 3
and 4.
© Hagit Shatkay, 2014
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