C How To Program Plus Mylab Programming With Pearson Etext -- Access Card Package (8th Edition)
8th Edition
ISBN: 9780134227023
Author: Paul J. Deitel; Harvey Deitel
Publisher: PEARSON
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Chapter 6, Problem 6.30E
(The Sieve of Eratosthenes) A prime integer is any integer greater than 1 that can be divided evenly only by itself and 1. The Sieve of Eratosthenes is a method of finding prime numbers. It works as follows:
- Create an array with all elements initialized to 1 (true). Array elements with prime indices will remain 1. All other array elements will eventually be set to zero.
- Starting with array index 2 (index 1 is not prime), every time an array element is found whose value is 1, loop through the remainder of the array and set to zero every element whose index is a multiple of the index for the element with value 1. For array index 2, all elements beyond 2 in the array that are multiples of 2 will be set to zero (indices 4, 6, 8, 10, and so on.). For array index 3, all elements beyond 3 in the array that are multiples of 3 will be set to zero (indices 6, 9, 12, 15, and so on.).
When this process is complete, the array elements that are still set to 1 indicate that the index is a prime number. Write a
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Consider the following database for some store:
Customers (cid, cname, city, discount)Agents (aid, aname, city, percent)Products (pid, pname, city, quantity, price)Orders (ordno, mon, cid, aid, pid, qty, dollars)
The relation Customers records the ID (cid), name (cname), location (city) of each customer and a discount percentage (discount) for this customer.
The relation Agents records the ID (aid), name (aname), location (city) of each agent and a transaction fee (percent) charged by this agent.
The relation Products lists the ID (pid), name (pname), location (city), quantity and price of available products.
And finally, the relation Orders contains a unique order number (ordno), the month (mon), customer (cid), agent (aid), product (pid), quantity (qty) of each order as well as the total value (dollars) of the transaction.
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(a) List customers (names) who do not have discounts but purchased at least one product of price greater than $50.
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Consider the following relational schema and briefly answer the questions that follow:
Emp(eid: integer, ename: string, age: integer, salary: real)
Works(eid: integer, did: integer, pct_time: integer)
Dept(did: integer, budget: real, managerid: integer)
a. Define a table constraint on Dept that will ensure that all managers have age > 30.
b. Write SQL statements to delete all information about employees whose salaries exceed that of the manager of one or more departments that they work in. Be sure to ensure that all the relevant integrity constraints are satisfied after your updates.
Consider the following relations:
Student(snum: integer, sname: string, rmajor: string,
level: string, age: integer)
Class(cname: string, meets_at: time, room: string, fid: integer)
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The meaning of these relations is straightforward; for example, Enrolled has one record per student-class pair such that the student is enrolled in the class.
2. Express each of the following integrity constraints in SQL unless it is implied by the primary and foreign key constraint; if so, explain how it is implied. If the constraint cannot be expressed in SQL, say so. For each constraint, state what operations (inserts, deletes, and updates on specific relations) must be monitored to enforce the constraint.
(a) Every faculty member must teach at least two courses.
(b) Every student must be enrolled in the course called 'Math101'.
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Chapter 6 Solutions
C How To Program Plus Mylab Programming With Pearson Etext -- Access Card Package (8th Edition)
Ch. 6 - Fill in the blanks in each of the following: C...Ch. 6 - State which of the following are true and which...Ch. 6 - Write statements to accomplish each of the...Ch. 6 - Consider a 2-by-5 integer array t. Write a...Ch. 6 - (Sales Commissions) Use a one-dimensional array to...Ch. 6 - (Bubble Sort) The bubble sort presented in Fig....Ch. 6 - Write loops that perform each of the following...Ch. 6 - Prob. 6.13ECh. 6 - (Mean, Median and Mode Program Modifications)...Ch. 6 - (Duplicate Elimination) Use a one-dimensional...
Ch. 6 - Label the elements of 3-by-5 two-dimensional array...Ch. 6 - What does the following program do?Ch. 6 - What does the following program do?Ch. 6 - (Dice Rolling) Write a program that simulates the...Ch. 6 - (Game of Craps) Write a program that runs 1000...Ch. 6 - Prob. 6.21ECh. 6 - (Total Sales) Use a two-dimensional array to solve...Ch. 6 - (Turtle Graphics) The Logo language made the...Ch. 6 - Prob. 6.24ECh. 6 - (Knights Tour: Brute-Force Approaches) In Exercise...Ch. 6 - (Eight Queens) Another puzzler for chess buffs is...Ch. 6 - (Eight Queens: Brute-Force Approaches) In this...Ch. 6 - (Duplicate Elimination) In Chapter 12, we explore...Ch. 6 - (Knights Tour: Closed Tour Test) In the Knights...Ch. 6 - (The Sieve of Eratosthenes) A prime integer is any...Ch. 6 - Prob. 6.31RECh. 6 - (Linear Search) Modify the program of Fig. 6.18 to...Ch. 6 - (Binary Search) Modify the program of Fig. 6.19 to...Ch. 6 - Prob. 6.35RECh. 6 - Prob. 6.36RECh. 6 - Prob. 6.37RE
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