Starting Out With Visual Basic (7th Edition)
7th Edition
ISBN: 9780134400150
Author: Tony Gaddis, Kip R. Irvine
Publisher: PEARSON
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Chapter 1.3, Problem 1.6CP
Why were computer
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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 1 Solutions
Starting Out With Visual Basic (7th Edition)
Ch. 1.1 - List the five major hardware components of a...Ch. 1.1 - Prob. 1.2CPCh. 1.1 - Prob. 1.3CPCh. 1.1 - What are the two general categories of software?Ch. 1.3 - What is an algorithm?Ch. 1.3 - Why were computer programming languages invented?Ch. 1.3 - What is an object? What is a control?Ch. 1.3 - What does event-driven mean?Ch. 1.3 - What is a property?Ch. 1.3 - Prob. 1.10CP
Ch. 1.3 - If a control has the programmer-defined name...Ch. 1.3 - What is the default name given to the first...Ch. 1.3 - Prob. 1.13CPCh. 1.4 - What four items should be identified when defining...Ch. 1.4 - Prob. 1.15CPCh. 1.4 - Prob. 1.16CPCh. 1.4 - Prob. 1.17CPCh. 1.4 - What is pseudocode?Ch. 1.4 - Prob. 1.19CPCh. 1.4 - What is the purpose of testing a program with...Ch. 1.4 - Prob. 1.21CPCh. 1.5 - Prob. 1.22CPCh. 1.5 - Prob. 1.23CPCh. 1.5 - Prob. 1.24CPCh. 1.5 - Prob. 1.25CPCh. 1.5 - What is a ToolTip?Ch. 1 - The job of the _____ is to fetch instructions,...Ch. 1 - Prob. 2FIBCh. 1 - The two general categories of software are _____...Ch. 1 - Prob. 4FIBCh. 1 - Since computers cannot be programmed in natural...Ch. 1 - _____ is the only language computers can process...Ch. 1 - Words that have predefined meaning in a...Ch. 1 - Prob. 8FIBCh. 1 - _____ are characters or symbols that perform...Ch. 1 - Prob. 10FIBCh. 1 - Prob. 11FIBCh. 1 - _____ is data the computer collects from the world...Ch. 1 - Prob. 13FIBCh. 1 - A(n) _____ is a set of well-defined steps for...Ch. 1 - Prob. 15FIBCh. 1 - _____ is human-readable code that looks similar to...Ch. 1 - Prob. 17FIBCh. 1 - Prob. 18FIBCh. 1 - Prob. 19FIBCh. 1 - Prob. 20FIBCh. 1 - Prob. 21FIBCh. 1 - The _____ window allows you to examine and change...Ch. 1 - Prob. 23FIBCh. 1 - Prob. 24FIBCh. 1 - Prob. 25FIBCh. 1 - Prob. 26FIBCh. 1 - Prob. 27FIBCh. 1 - Prob. 28FIBCh. 1 - You can access the full documentation for Visual...Ch. 1 - Prob. 30FIBCh. 1 - What is the difference between main memory and...Ch. 1 - What is the difference between operating system...Ch. 1 - What is an object?Ch. 1 - What is a control?Ch. 1 - Prob. 5SACh. 1 - Prob. 6SACh. 1 - What is an object? What is a control?Ch. 1 - Prob. 8SACh. 1 - Prob. 9SACh. 1 - Prob. 10SACh. 1 - Prob. 11SACh. 1 - Prob. 12SACh. 1 - Prob. 13SACh. 1 - Prob. 14SACh. 1 - Prob. 15SACh. 1 - Prob. 16SACh. 1 - What is pseudocode?Ch. 1 - Prob. 18SACh. 1 - Prob. 19SACh. 1 - Prob. 20SACh. 1 - Prob. 21SACh. 1 - Prob. 22SACh. 1 - What is a ToolTip?Ch. 1 - Prob. 24SACh. 1 - Prob. 25SACh. 1 - Figure 1-30 shows the Visual Studio IDE. What are...Ch. 1 - Are each of the following control names legal or...Ch. 1 - Prob. 2WDTCh. 1 - Prob. 3WDTCh. 1 - The following control names appear in a Visual...Ch. 1 - Carpet Size You have been asked to create an...Ch. 1 - Available Credit A retail store gives each of its...Ch. 1 - Sales Tax Solving the Sales Tax Problem Perform...Ch. 1 - Account Balance Perform Steps 1 through 6 of the...
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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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