Introduction to Programming with C++
3rd Edition
ISBN: 9780133252811
Author: Y. Daniel Liang
Publisher: Prentice Hall
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Textbook Question
Chapter 3, Problem 25CP
Are the following two expressions the same?
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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.
1. Express the following query in SQL
(a) List customers (names) who do not have discounts but purchased at least one product of price greater than $50.
(b) Find…
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)
Enrolled(snum: integer, cname: string)
Faculty(fid: integer, fname: string, deptid: integer)
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'.
(c) A student cannot add more than two courses at a time…
Chapter 3 Solutions
Introduction to Programming with C++
Ch. 3 - List six relational operators.
Ch. 3 - Prob. 2CPCh. 3 - Show the printout of the following code:
Ch. 3 - Write an if statement that assigns 1 to x if y is...Ch. 3 - Write an if statement that increases pay by 3 if...Ch. 3 - Prob. 6CPCh. 3 - Write an if statement that increases pay by if...Ch. 3 - Prob. 8CPCh. 3 - Prob. 9CPCh. 3 - Suppose Show the output, if any, of the following...
Ch. 3 - What is wrong in the following code?...Ch. 3 - Show the output of the following code:
Ch. 3 - Which of the following statements are equivalent?...Ch. 3 - Prob. 14CPCh. 3 - Are the following statements correct? Which one is...Ch. 3 - Prob. 16CPCh. 3 - Are the following statements equivalent?Ch. 3 - Prob. 18CPCh. 3 - a. How do you generate a random integer i such...Ch. 3 - Write an expression that obtains a random between...Ch. 3 - Prob. 21CPCh. 3 - (a) Write a Boolean expression that evaluates to...Ch. 3 - (a) Write a Boolean expression for x54.5. (b)...Ch. 3 - To test whether is between 10 and 100, which of...Ch. 3 - Are the following two expressions the same?
Ch. 3 - What is the value of the expression
Ch. 3 - Suppose, when you run the program, you enter the...Ch. 3 - Write a Boolean expression that evaluates to true...Ch. 3 - Write a Boolean expression that evaluates to true...Ch. 3 - Write a Boolean expression that evaluates to true...Ch. 3 - Write a Boolean expression that evaluates to true...Ch. 3 - What data types are required for a switch...Ch. 3 - What is y after the following switch statement is...Ch. 3 - What is x after the following if-else statement is...Ch. 3 - Suppose that, when you run the following program,...Ch. 3 - Rewrite the following if statements using the...Ch. 3 - Rewrite the following conditional expressions...Ch. 3 - List the precedence order of the Boolean...Ch. 3 - True or false? All the binary operators except =...Ch. 3 - Evaluate the following expressions:...Ch. 3 - ...Ch. 3 - (Algebra: solve quadratic equations) The two roots...Ch. 3 - (Check numbers) Write a program that prompts the...Ch. 3 - (Algebra: solve 22 linear equations) You can use...Ch. 3 - (Check temperature) Write a program that prompts...Ch. 3 - (Find future dates) Write a program that prompts...Ch. 3 - (Health application: BMI) Revise Listing 3.2,...Ch. 3 - Prob. 7PECh. 3 - (Financial application: monetary units) Modify...Ch. 3 - (Find the number of days in a month) Write a...Ch. 3 - (Game: addition quiz) Listing 3.4,...Ch. 3 - (Cost of shipping) A shipping company uses the...Ch. 3 - (Game: heads or tails) Write a program that lets...Ch. 3 - Prob. 13PECh. 3 - (Game: lottery) Revise Listing 3.7, Lottery.cpp,...Ch. 3 - (Game: scissor, rock, paper) Write a program that...Ch. 3 - (Compute the perimeter of a triangle) Write a...Ch. 3 - (Science: wind-chill temperature) Programming...Ch. 3 - (Game: addition for three numbers) Listing 3.4,...Ch. 3 - (Geometry: point in a circle?) Write a program...Ch. 3 - (Geometry: point in a rectangle?) Write a program...Ch. 3 - (Game: pick a card) Write a program that simulates...Ch. 3 - (Geometry: intersecting point) Two points on line...Ch. 3 - (Geometry: points in triangle'?) Suppose a right...Ch. 3 - (Use the operators) Write a program that prompts...Ch. 3 - (Geometry: two rectangles) Write a program that...Ch. 3 - (Geometry: two circles) Write a program that...Ch. 3 - Prob. 27PECh. 3 - (Financials: currency exchange) Write a program...Ch. 3 - Prob. 29PECh. 3 - (Financial: compare costs) Suppose you shop for...Ch. 3 - Prob. 31PECh. 3 - (Algebra: slope-intercept form) Write a program...Ch. 3 - (Science: day of the week)) Zeller's congruence is...Ch. 3 - Prob. 34PECh. 3 - (Business: check ISBN-10) An lSBN-10...Ch. 3 - (Palindrome number) Write a program that prompts...
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- Consider the following relational schema. An employee can work in more than one department; the pct_time field of the Works relation shows the percentage of time that a given employee works in a given department. Emp(eid: integer, ename: string, age: integer, salary: real) Works(eid: integer, did: integer, pct_time: integer) Dept(did: integer, budget: real, managerid: integer) Write the following queries in SQL: a. Print the name of each employee whose salary exceeds the budget of all of the departments that he or she works in. b. Find the enames of managers who manage only departments with budgets larger than $1 million, but at least one department with budget less than $5 million.arrow_forwardConsider the following schema: Suppliers(sid: integer, sname: string, address: string) Parts(pid: integer, pname: string, color: string) Catalog(sid: integer, pid: integer, cost: real) The Catalog relation lists the prices charged for parts by suppliers. Write the following queries in SQL: a. Find the sids of suppliers who charge more for some part than the average cost of that part (averaged over all the suppliers who supply that part). b. Find the sids of suppliers who supply a red part or a green part. c. For every supplier that supplies a green part and a red part, print the name and price of the most expensive part that she supplies.arrow_forwardThe following relations keep track of airline flight information: Flights(flno: integer, from: string, to: string, distance: integer, departs: time, arrives: time, price: integer) Aircraft(aid: integer, aname: string, cruisingrange: integer) Certified(eid: integer, aid: integer) Employees(eid: integer, ename: string, salary: integer) Note that the Employees relation describes pilots and other kinds of employees as well; every pilot is certified for some aircraft, and only pilots are certified to fly. Write each of the following queries in SQL.(Additional queries using the same schema are listed in the exercises for Chapter 4) a. Identify the routes that can be piloted by every pilot who makes more than $100,000. b. Print the name and salary of every nonpilot whose salary is more than the average salary for pilots. c. Print the names of employees who are certified only on aircrafts with cruising range longer than 1000 miles and who are certified on some Boeing…arrow_forward
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