Pearson eText for Starting out with Visual C# -- Instant Access (Pearson+)
5th Edition
ISBN: 9780137502783
Author: Tony Gaddis
Publisher: PEARSON+
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Textbook Question
Chapter 2, Problem 8TF
When you double-click a control in the Designer, Visual Studio not only creates an empty event handler, but it also writes some code that you don’t sec, elsewhere in the project that is necessary for the event handler to properly function.
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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'.
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Chapter 2 Solutions
Pearson eText for Starting out with Visual C# -- Instant Access (Pearson+)
Ch. 2.1 - Prob. 2.1CPCh. 2.1 - Prob. 2.2CPCh. 2.1 - What is the purpose of an objects sizing handles?Ch. 2.1 - What must each form and control in an applications...Ch. 2.1 - Prob. 2.5CPCh. 2.1 - Prob. 2.6CPCh. 2.1 - Prob. 2.7CPCh. 2.1 - What does a forms Text property determine?Ch. 2.1 - Prob. 2.9CPCh. 2.1 - Prob. 2.10CP
Ch. 2.1 - Prob. 2.11CPCh. 2.1 - Prob. 2.12CPCh. 2.1 - What are the rules for naming controls?Ch. 2.1 - What naming convention do most C# programmers use...Ch. 2.3 - A file that contains program code is known as what...Ch. 2.3 - What must you do if you want your application to...Ch. 2.3 - What does the Program.cs file contain?Ch. 2.3 - Prob. 2.18CPCh. 2.3 - Prob. 2.19CPCh. 2.3 - Prob. 2.20CPCh. 2.3 - Prob. 2.21CPCh. 2.3 - Prob. 2.22CPCh. 2.3 - Prob. 2.23CPCh. 2.3 - Prob. 2.24CPCh. 2.3 - What method do you use in Visual C# to display a...Ch. 2.3 - What is a literal?Ch. 2.3 - Prob. 2.27CPCh. 2.3 - Prob. 2.28CPCh. 2.5 - In which group of the Toolbox can you find the...Ch. 2.5 - Prob. 2.30CPCh. 2.5 - Prob. 2.31CPCh. 2.5 - Prob. 2.32CPCh. 2.5 - Prob. 2.33CPCh. 2.5 - Prob. 2.34CPCh. 2.5 - Prob. 2.35CPCh. 2.5 - How can you use a Label control to display output...Ch. 2.5 - What happens if you assign an empty string to a...Ch. 2.7 - What is a PictureBox control used for?Ch. 2.7 - Prob. 2.39CPCh. 2.7 - Prob. 2.40CPCh. 2.7 - Prob. 2.41CPCh. 2.7 - Prob. 2.42CPCh. 2.7 - Prob. 2.43CPCh. 2.7 - Prob. 2.44CPCh. 2.8 - Prob. 2.45CPCh. 2.8 - Prob. 2.46CPCh. 2.8 - Prob. 2.47CPCh. 2.8 - Why do programmers insert blank lines and...Ch. 2.10 - What statement do you use to close an applications...Ch. 2.10 - Prob. 2.50CPCh. 2.10 - Prob. 2.51CPCh. 2.10 - Prob. 2.52CPCh. 2 - Prob. 1MCCh. 2 - Prob. 2MCCh. 2 - __________ is the name of the blank form that...Ch. 2 - Prob. 4MCCh. 2 - A file that contains program code is called a(n)...Ch. 2 - A namespace is container that holds __________. a....Ch. 2 - A(n) __________ is a method that executes when a...Ch. 2 - Prob. 8MCCh. 2 - Prob. 9MCCh. 2 - Prob. 10MCCh. 2 - Prob. 11MCCh. 2 - The time during which you build the GUI and write...Ch. 2 - The time during which an application is executing...Ch. 2 - When you want to display text on a form, you use a...Ch. 2 - The __________ property allows you to set the...Ch. 2 - A __________ property can be set to one of two...Ch. 2 - Prob. 17MCCh. 2 - Prob. 18MCCh. 2 - In code, you use a(n) __________ to store a value...Ch. 2 - Prob. 20MCCh. 2 - The standard notation for referring to a controls...Ch. 2 - __________ is a feature of Visual Studio that...Ch. 2 - Prob. 23MCCh. 2 - Prob. 24MCCh. 2 - Prob. 25MCCh. 2 - Prob. 26MCCh. 2 - Most controls have a __________ property that...Ch. 2 - A(an) __________ appears on one line in a program....Ch. 2 - A __________ can occupy multiple consecutive lines...Ch. 2 - Programmers commonly use blank lines and...Ch. 2 - To close an applications form in code, you use the...Ch. 2 - Changing an objects Text property also changes the...Ch. 2 - When a form is created, its Text property is...Ch. 2 - The forms title is displayed in the bar along the...Ch. 2 - Prob. 4TFCh. 2 - Prob. 5TFCh. 2 - Prob. 6TFCh. 2 - In C# code, each opening brace must have a...Ch. 2 - When you double-click a control in the Designer,...Ch. 2 - Prob. 9TFCh. 2 - Prob. 10TFCh. 2 - Prob. 11TFCh. 2 - Prob. 12TFCh. 2 - Prob. 13TFCh. 2 - Prob. 14TFCh. 2 - Prob. 15TFCh. 2 - Prob. 16TFCh. 2 - When you write the values true or false in code,...Ch. 2 - Prob. 18TFCh. 2 - To close an applications form in code, you use the...Ch. 2 - The Visual Studio code editor examines each...Ch. 2 - What does a bounding box indicate about an object...Ch. 2 - Prob. 2SACh. 2 - What determines an objects appearance and other...Ch. 2 - Prob. 4SACh. 2 - Prob. 5SACh. 2 - What steps must you perform to change a forms Size...Ch. 2 - Prob. 7SACh. 2 - Prob. 8SACh. 2 - Prob. 9SACh. 2 - Prob. 10SACh. 2 - Prob. 11SACh. 2 - Prob. 12SACh. 2 - Prob. 13SACh. 2 - Prob. 14SACh. 2 - Prob. 15SACh. 2 - Prob. 16SACh. 2 - Prob. 17SACh. 2 - Prob. 18SACh. 2 - What are the three types of comments you can use...Ch. 2 - How does Visual Studio help you to quickly correct...Ch. 2 - Prob. 1AWCh. 2 - Prob. 2AWCh. 2 - Prob. 3AWCh. 2 - Suppose an applications GUI has a Label control...Ch. 2 - Suppose an applications GUI has a PictureBox...Ch. 2 - Latin Translator Look at the following list of...Ch. 2 - Prob. 2PPCh. 2 - Prob. 3PPCh. 2 - Joke and Punch Line A joke typically has two...Ch. 2 - Prob. 5PPCh. 2 - Prob. 6PP
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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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