
Starting Out With Java: From Control Structures Through Objects, Student Value Edition (7th Edition)
7th Edition
ISBN: 9780134802817
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 15, Problem 2SA
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Given a relation schema R = (A, B, C, D, E,G) with a set of functional dependencies
F {ABCD
BC → DE
B→ D
D→ A}.
(a) Show that R is not in BCNF using the functional dependency A → BCD.
(b) Show that AG is a superkey for R
(c) Compute a canonical cover Fc for the set of functional dependencies F. Show your work.
(d) Give a 3NF decomposition of R based on the canonical cover found in (c). Show your
work.
(e) Give a BCNF decomposition of R using F. Show your work.
The following entity-relationship (ER) diagram models a database that helps car deal-
ers maintain records of customers and cars in their inventory.
Construct a relational database schema from the ER diagram. Your set of schemas should
include primary-key and foreign-key constraints and you should ensure there are no redundant
schemas.
has_model
model
modelID
name
vehicle
has_vehicle
VIN
dealer_ID
brand
name
has_available_option
has_option
has_dealer
options
options_ID
specification
dealer
dealer ID
name
customer_ID
owned_by
customer
customer ID
name
A relation schema R = (A, B, C, D, E) with a set of functional dependencies
F= {D A
CAB}
is decomposed into R₁ = (A, B, C) and R2 = (C, D, E).
(a) Is this a lossless-join decomposition? Why or why not?
(b) Is the decomposition dependency preserving? Why or why not?
Chapter 15 Solutions
Starting Out With Java: From Control Structures Through Objects, Student Value Edition (7th Edition)
Chapter 15.2, Problem 15.1CPChapter 15.2, Problem 15.2CPChapter 15.2, Problem 15.3CPChapter 15.2, Problem 15.4CPChapter 15.2, Problem 15.5CPChapter 15, Problem 1MCChapter 15, Problem 2MCChapter 15, Problem 3MCChapter 15, Problem 4MCChapter 15, Problem 5MC
Chapter 15, Problem 6MCChapter 15, Problem 7TFChapter 15, Problem 8TFChapter 15, Problem 9TFChapter 15, Problem 10TFChapter 15, Problem 1FTEChapter 15, Problem 1AWChapter 15, Problem 2AWChapter 15, Problem 3AWChapter 15, Problem 4AWChapter 15, Problem 5AWChapter 15, Problem 6AWChapter 15, Problem 7AWChapter 15, Problem 1SAChapter 15, Problem 2SAChapter 15, Problem 3SAChapter 15, Problem 4SAChapter 15, Problem 5SAChapter 15, Problem 6SAChapter 15, Problem 7SAChapter 15, Problem 1PCChapter 15, Problem 2PCChapter 15, Problem 3PCChapter 15, Problem 4PCChapter 15, Problem 5PCChapter 15, Problem 6PCChapter 15, Problem 7PCChapter 15, Problem 8PCChapter 15, Problem 9PCChapter 15, Problem 10PC
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