EBK C HOW TO PROGRAM
8th Edition
ISBN: 9780133964639
Author: Deitel
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Chapter 4, Problem 4.25E
(Table of Decimal, Binary, Octal and Hexadecimal Equivalents)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.
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 4 Solutions
EBK C HOW TO PROGRAM
Ch. 4 - Find the error in each of the following. (Note:...Ch. 4 - State which values of the control variable x are...Ch. 4 - Write for statements that print the following...Ch. 4 - Prob. 4.8ECh. 4 - (Sum a Sequence of Integers) Write a program that...Ch. 4 - (Average a Sequence of Integers) Write a program...Ch. 4 - (Find the Smallest) Write a program that finds the...Ch. 4 - (Calculating the Sum of Even Integers) Write a...Ch. 4 - (Calculating the Product of Odd Integers) Write a...Ch. 4 - (Factorials) The factorial function is used...
Ch. 4 - (Modified Compound-Interest Program) Modify the...Ch. 4 - (Triangle-Printing Program) Write a program that...Ch. 4 - (Calculating Credit Limits) Collecting money...Ch. 4 - (Bar-Chart Printing Program) One interesting...Ch. 4 - (Calculating Sales)An online retailer sells five...Ch. 4 - (Truth Tables) Complete the following truth tables...Ch. 4 - Rewrite the program of Fig. 4.2 so that the...Ch. 4 - Prob. 4.22ECh. 4 - (Calculating the Compound Interest with...Ch. 4 - Assume i=1,j=2,k=3andm=2. What does each of the...Ch. 4 - (Table of Decimal, Binary, Octal and Hexadecimal...Ch. 4 - (Calculating the Value of )Calculate the value of...Ch. 4 - Prob. 4.27ECh. 4 - (Calculating Weekly Pay)A company pays its...Ch. 4 - (De Morgans Laws)In this chapter, we discussed the...Ch. 4 - (Replacing switch with if ... else)Rewrite the...Ch. 4 - (Diamond-Printing Program)Write a program that...Ch. 4 - (Modified Diamond-Printing Program)Modify the...Ch. 4 - (Roman-Numeral Equivalent of Decimal Values)Write...Ch. 4 - Describe the process you would use to replace a do...Ch. 4 - A criticism of the break statement and the...Ch. 4 - Prob. 4.36ECh. 4 - Describe in general how you would remove any...Ch. 4 - (The Twelve Days of Christmas Song) Write a...Ch. 4 - (Limitations of Floating-Point Numbers for...Ch. 4 - (World Population Growth) World population has...Ch. 4 - (Tax Plan Alternatives; The FairTax) There are...
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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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