Starting Out With Visual C# (5th Edition)
5th Edition
ISBN: 9780135183519
Author: Tony Gaddis
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 6MC
A __________ file contains data that has been encoded as text, using a scheme such as Unicode.
- a. text
- b. character
- c. Unicode
- d. system
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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)
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…
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.
Chapter 5 Solutions
Starting Out With Visual C# (5th Edition)
Ch. 5.1 - Prob. 5.1CPCh. 5.1 - Prob. 5.2CPCh. 5.1 - Prob. 5.3CPCh. 5.2 - What is a loop iteration?Ch. 5.2 - What is a counter variable?Ch. 5.2 - What is a pretest loop?Ch. 5.2 - Does the while loop rest its condition before or...Ch. 5.2 - What is an infinite loop?Ch. 5.3 - What messages will the following code sample...Ch. 5.3 - How many rimes will the following loop iterate?...
Ch. 5.4 - Name the three expressions that appear inside the...Ch. 5.4 - You want to write a for loop that displays I love...Ch. 5.4 - What would the following code display? for (int...Ch. 5.4 - What would the following code display? for (int...Ch. 5.5 - What is a posttest loop?Ch. 5.5 - What is the difference between the while loop and...Ch. 5.5 - How many times will the following loop iterate?...Ch. 5.6 - What is an output file?Ch. 5.6 - What is an input file?Ch. 5.6 - What three steps must be taken by a program when...Ch. 5.6 - What is the difference between a text file and a...Ch. 5.6 - Prob. 5.22CPCh. 5.6 - What type of object do you create if you want to...Ch. 5.6 - What type of object do you create if you want to...Ch. 5.6 - If you call the File.CreateText method and the...Ch. 5.6 - If you call the File.AppendText method and the...Ch. 5.6 - What is the difference between the WriteLine and...Ch. 5.6 - What method do you call to open a text file to...Ch. 5.6 - What is a files read position? Initially, where is...Ch. 5.6 - How do you read a line of text from a text file?Ch. 5.6 - How do you close a file?Ch. 5.6 - Assume inputFile references a StreamReader object...Ch. 5.7 - What is the benefit of using an Open and/or Save...Ch. 5.7 - Prob. 5.34CPCh. 5.8 - What does a Random objects Next method return?Ch. 5.8 - What does a Random objects NextDouble method...Ch. 5.8 - Write code that creates a Random object and then...Ch. 5.8 - Write code that creates a Random object and then...Ch. 5.8 - Prob. 5.39CPCh. 5.8 - What happens if the same seed value is used each...Ch. 5.9 - Prob. 5.41CPCh. 5.9 - Prob. 5.42CPCh. 5 - ListBox controls have an __________ method that...Ch. 5 - A __________ is commonly used to control the...Ch. 5 - A(n) __________ loop tests its condition before...Ch. 5 - The term __________ is used to describe a file...Ch. 5 - The term __________ file is used to describe a...Ch. 5 - A __________ file contains data that has been...Ch. 5 - When you work with a __________ file you access...Ch. 5 - Prob. 8MCCh. 5 - A __________ object is an object that is...Ch. 5 - When a program works with an input file, a special...Ch. 5 - When the user selects a file with the Open dialog...Ch. 5 - The __________ control displays a standard Windows...Ch. 5 - Once you have created a Random object, you can...Ch. 5 - Prob. 14MCCh. 5 - When you run an application, the applications form...Ch. 5 - If the ListBox is empty, the Items.Count property...Ch. 5 - To increment a variable means to increase its...Ch. 5 - When a variable is declared in the initialization...Ch. 5 - The while loop always performs at least one...Ch. 5 - The term read file is used to describe a file that...Ch. 5 - To append data to an existing file, you open it...Ch. 5 - As items are read from the file, the read position...Ch. 5 - The numbers that are generated by the Random class...Ch. 5 - Prob. 10TFCh. 5 - What is contained in the body of a loop?Ch. 5 - Write a programming statement that uses postfix...Ch. 5 - How many iterations will occur if the test...Ch. 5 - What are filename extensions? What do they...Ch. 5 - When an input file is opened, what is its read...Ch. 5 - How can you read all of the items in a file...Ch. 5 - What is a variable that is used to accumulate a...Ch. 5 - By default, the Open dialog box displays the...Ch. 5 - Prob. 9SACh. 5 - Prob. 10SACh. 5 - Write a loop that displays your name 10 times.Ch. 5 - Write a loop that displays all the odd numbers...Ch. 5 - Write a loop that displays every fifth number from...Ch. 5 - Write a code sample that uses a loop to write the...Ch. 5 - Assume that a file named People.txt contains a...Ch. 5 - Distance Calculator If you know a vehicles speed...Ch. 5 - Distance File Modify the Distance Calculator...Ch. 5 - Celsius to Fahrenheit Table Assuming that C is a...Ch. 5 - Prob. 4PPCh. 5 - Pennies for Pay Susan is hired for a job, and her...Ch. 5 - Prob. 6PPCh. 5 - Prob. 7PPCh. 5 - Prob. 8PPCh. 5 - Prob. 9PPCh. 5 - Addition Tutor Create an application that...Ch. 5 - Random Number Guessing Game Create an application...Ch. 5 - Calculating the Factorial of a Number In...Ch. 5 - Random Number File Writer Create an application...Ch. 5 - Random Number File Reader This exercise assumes...
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