Microsoft Visual C#: An Introduction to Object-Oriented Programming, Loose-leaf Version
7th Edition
ISBN: 9781337685771
Author: Joyce Farrell
Publisher: Cengage Learning
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Chapter 4, Problem 4RQ
If the following code segment compiles correctly, what do you know about the variable x?
if(x) WriteLine(“OK”);
a. x is an integer variable.
b. x is a Boolean variable.
c. x is greater than 0.
d. none of these
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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
Microsoft Visual C#: An Introduction to Object-Oriented Programming, Loose-leaf Version
Ch. 4 - What is the output of the following code...Ch. 4 - What is the output of the following code...Ch. 4 - Prob. 3RQCh. 4 - If the following code segment compiles correctly,...Ch. 4 - What is the output of the following code...Ch. 4 - What is the output of the following code...Ch. 4 - What is the output of the following code...Ch. 4 - What is the output of the following code...Ch. 4 - Which of the following expressions is equivalent...Ch. 4 - Which of the following expressions assigns true to...
Ch. 4 - Which of the following expressions is equivalent...Ch. 4 - How many case labels would a switch statement...Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Which of the following is equivalent to the...Ch. 4 - Which of the following C# expressions is...Ch. 4 - Which of the following C# expressions means, If...Ch. 4 - Prob. 18RQCh. 4 - Prob. 19RQCh. 4 - Which of the following C# expressions results in...Ch. 4 - Write a program named CheckCredit that prompts...Ch. 4 - Write a program named Twitter that accepts a users...Ch. 4 - Write a program named Admission for a colleges...Ch. 4 - The Saffir-Simpson Hurricane Scale classifies...Ch. 4 - a. Write a program named CheckMonth that prompts a...Ch. 4 - Account numbers sometimes contain a check digit...Ch. 4 - Write a program named GuessingGame that generates...Ch. 4 - In the game Rock paper Scissors, two players...Ch. 4 - Create a lottery game application named Lottery....Ch. 4 - Each of the following files in the Chapter.04...Ch. 4 - In Chapter 2, you created an interactive...Ch. 4 - In Chapter 2, you created an interactive...
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