DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Expert Solution & Answer
Chapter 16, Problem 3PE
Explanation of Solution
a.
Proof:
Consider the expression given below:
ΠA(r − s) and ΠA(r)−ΠA(s)
Assume, r = {(1, 2)}, and s = {(1, 3)}...
Explanation of Solution
b.
Proof:
Consider the expression given below:
σB<4( Aγmax(B) as B(r)) and Aγmax(B) as B(σB<4(r))
Assume, r = {(1, 2), (1, 5)}...
Explanation of Solution
c.
Equivalence of expressions:
“Yes”, the expressions will be equivalent if the max is replaced by min...
Explanation of Solution
d.
Proof:
Consider the expression given below:
(r⟖s)⟖t and r⟖(s⟖t)
Assume, r = {(1, 2)}, s = {(2, 3)}, t = {(1, 4)}...
Explanation of Solution
e.
Expression:
Proof:
Consider the expression given below:
σθ(E1⟕E2) and E1⟕σθ(E2)
Let R be of the schema (A, B) and S of (A, C).
Assume, r = {(1, 2)}, s = {(2, 3)} and let u be the expression C = 1...
Expert Solution & Answer
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Students have asked these similar questions
1.) Consider the problem of determining whether a DFA and a regular expression are
equivalent. Express this problem as a language and show that it is decidable.
ii) Let ALLDFA = {(A)| A is a DFA and L(A) = "}. Show that ALLDFA is decidable.
iii) Let AECFG = {(G)| G is a CFG that generates &}. Show that AECFG is decidable.
iv) Let ETM {(M)| M is a TM and L(M) = 0}. Show that ETM, the complement of
Erm, is Turing-recognizable.
Let X be the set {1, 2, 3, 4, 5} and Y be the set {6, 7, 8, 9, 10). We describe the
functions f: XY and g: XY in the following tables. Answer each part
and give a reason for each negative answer.
n
f(n)
n
g(n)
1
6
1
10
2
7
2
9
3
6
3
8
4
7
4
7
5
6
5
6
Aa. Is f one-to-one?
b. Is fonto?
c. Is fa correspondence?
Ad. Is g one-to-one?
e. Is g onto?
f.
Is g a correspondence?
vi) Let B be the set of all infinite sequences over {0,1}. Show that B is uncountable
using a proof by diagonalization.
Can you find the least amount of different numbers to pick from positive numbers (integers) that are at most 100 to confirm two numbers that add up to 101 when each number can be picked at most two times?
Can you find the formula for an that satisfies the provided recursive definition? Please show all steps and justification
Chapter 16 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
Ch. 16 - Prob. 2PECh. 16 - Prob. 3PECh. 16 - SQL allows relations with duplicates (Chapter 3),...Ch. 16 - Prob. 5PECh. 16 - Prob. 6PECh. 16 - Prob. 7PECh. 16 - Prob. 8PECh. 16 - Prob. 9PECh. 16 - Prob. 10PECh. 16 - Prob. 12PE
Ch. 16 - Prob. 13PECh. 16 - Prob. 14PECh. 16 - Prob. 16ECh. 16 - Prob. 17ECh. 16 - Prob. 19ECh. 16 - Explain how to use a histogram to estimate the...Ch. 16 - Prob. 21ECh. 16 - Prob. 22ECh. 16 - Describe how to incrementally maintain the results...Ch. 16 - Prob. 24ECh. 16 - Prob. 25ECh. 16 - Prob. 26ECh. 16 - Prob. 27E
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