EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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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
You are given a class that processes purchases for an online store. The class receives calls to:
•
Retrieve the prices for items from a database
• Record the sold items
•
Update the database
•
Refresh the webpage
a. What architectural pattern is suitable for this scenario? Illustrate your answer by drawing a
model for the solution, showing the method calls/events.
b. Comment on how applying this pattern will impact the modifiability of the system.
c. Draw a sequence diagram for the update operation.
The images I have uploaded are the part 1 to 4 and questions below are continue on the questions uploaded
5. C++ Class Template with Method Stubs
#pragma once
#include <iostream>
#include <string>
#include <stdexcept>
#include <vector>
template <typename T>
class HashTable {
private:
struct Entry {
std::string key;
T value;
bool isOccupied;
bool isDeleted;
Entry() : key(""), value(), isOccupied(false), isDeleted(false) {}
};
Entry* table;
size_t capacity;
size_t size;
double loadFactorThreshold;
size_t customHash(const std::string& key) const {
size_t hash = 5381;
for (char c : key) {
hash = ((hash << 5) + hash) + c;
}
return hash;
}
size_t probe(const std::string& key, bool forInsert = false) const;
void resize();
public:
// Constructor
HashTable(size_t initialCapacity = 101);
// Big…
this project is NOT for graded(marks) purposes, please help me with the introduction. give me answers for the project. i will include an image explaining everything about the project.
Chapter 16 Solutions
EBK DATABASE SYSTEM CONCEPTS
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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