Database Modeling and Design

Exercises 257
Given table R(A,B,C) and the set {R1(A,B), R2(B,C)} satisfies the lossless
decomposition property:
1. Does the multivalued dependency B->>C hold?
2. Is B a candidate key?
3. Is R in 4NF?
Given a table “skills_available” with attributes empno, project, and
skill, in which the semantics of “skills_available” state that every
skill an employee has must be used on every project that employee
works on:
1. Is the level of normalization of “skills_available” at least 4NF?
2. Given table R(A,B,C) with actual data shown below:
a. Does the multivalued dependency B->>C hold?
b. Is R in 5NF?
R: A B C
w x p
w x q
z x p
z x q
w y q
z y p
Logical Database Design (Generic Problem)
Problem 7-1
Design and implement a small database that will be useful to your company
or student organization.
1. State the purpose of the database in a few sentences.
2. Construct an ER or UML class diagram for the database.
3. Transform your ER or UML diagram into a working database with
five to ten rows per table of data you can make up to fit the data-