9th Edition

ISBN: 9781111527273

Author: Philip J. Pratt

Publisher: Course Technology Ptr

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SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.

Queries

A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prio…

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Textbook Question

Chapter 7, Problem 3SCG

Create a view named CONDO_FEES. It consists of two columns: the first is the square footage, and the second is the average fee for all condos in the CONDO_UNIT table that have that square footage. Use AVERAGE_FEE as the column name for the average fee. Group and order the rows by square footage.

a. Write and execute the CREATE VIEW command to create the CONDO_FEES view.
b. Write and execute the command to retrieve the square footage and average fee for each square footage for which the average fee is greater than $500.
c. Write and execute the query that the DBMS actually executes.
d. Does updating the database through this view create any problems? If so, what are they? If not, why not?

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Chapter 7, Problem 2SCG

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Chapter 7 Solutions

A Guide to SQL

Ch. 7 - What is a view?Ch. 7 - Which command creates a view?Ch. 7 - Prob. 3RQ Ch. 7 - What happens when a user retrieves data from a...Ch. 7 - What are three advantages of using views?Ch. 7 - Which command deletes a view?Ch. 7 - Prob. 8RQ Ch. 7 - Which command terminates previously granted...Ch. 7 - Prob. 10RQ Ch. 7 - How do you create an index? How do you create a...

Ch. 7 - Prob. 12RQ Ch. 7 - Does the DBMS or the user make the choice of which...Ch. 7 - Describe the information the DBMS maintains in the...Ch. 7 - The CUSTOMER table contains a foreign key,...Ch. 7 - Prob. 16RQ Ch. 7 - Prob. 17RQ Ch. 7 - Prob. 18RQ Ch. 7 - Prob. 19RQ Ch. 7 - When would you usually specify primary key...Ch. 7 - Prob. 21RQ Ch. 7 - Prob. 22RQ Ch. 7 - Prob. 23RQ Ch. 7 - Use SQL to make the following changes to the TAL...Ch. 7 - Create a view named ITEM_ORDER. It consists of the...Ch. 7 - Create a view named ORDER_TOTAL. It consists of...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5TD Ch. 7 - Perform the following tasks: a. Create an index...Ch. 7 - Delete the index named ITEM_INDEX3.Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9TD Ch. 7 - Prob. 10TD Ch. 7 - Toys Galore currently has a credit limit of 7,500....Ch. 7 - Use SQL to make the following changes to the...Ch. 7 - Create a view named RESERVATION_CUSTOMER. It...Ch. 7 - Create a view named TRIP_INVENTORY. It consists of...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5CAT Ch. 7 - Create the following indexes: a. Create an index...Ch. 7 - Prob. 7CAT Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9CAT Ch. 7 - Ensure that the only legal values for the TYPE...Ch. 7 - Prob. 11CAT Ch. 7 - Use SQL to make the following changes to the...Ch. 7 - Create a view named CONDO_OWNERS. It consists of...Ch. 7 - Create a view named CONDO_FEES. It consists of two...Ch. 7 - Write, but do not execute, the commands to grant...Ch. 7 - Prob. 5SCG Ch. 7 - Prob. 6SCG Ch. 7 - Delete the OWNER_INDEX 3 index from the OWNER...Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9SCG Ch. 7 - Ensure that the only legal values for the BDRMS...Ch. 7 - Prob. 11SCG

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Solution Summary: The author explains that view is a virtual table that does not exist physically. It provides security to tables in database.

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