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A Guide to SQL

9th Edition
Philip J. Pratt
Publisher: Course Technology Ptr
ISBN: 9781111527273
Chapter 7, Problem 7RQ
Textbook Problem
7 views

Which command deletes a view?

Program Plan Intro

 View:

The “VIEW” in the SQL (Structured Query Language) is a virtual table that does not exist physically. It is formed by a SQL statement that links one or more tables.

  • The view is considered as derived table because the data is comes from one or more base tables.
  • It is a logical representation of table, all the operations asked by user on a view are really done on the underlying base table.
  • View provides security to tables in database.

Syntax for create a view:

  CREATE VIEW View_name AS

  SELECT column_name(s)

  FROM table_name

  WHERE condition

Here,

  • “CREATE”, “VIEW” are the keywords which are used to create a view for the attributes of table.
  • “View_name” is a name of the view.
  • “As” is the keyword to retrieve actual query.
  • Define the query from “SELECT” keyword of the command.

Explanation of Solution

Command to delete a view:

The command “DROP VIEW” is to delete a view from database.

Syntax:

DROP VIEW View_name

Here,

  • “DROP”, “VIEW” are the keywords which are used to delete a view...

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Chapter 7 Solutions

A Guide to SQL
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Ch. 7 - Which command deletes an index?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 - Which command do you use to obtain information...Ch. 7 - How is the system catalog updated?Ch. 7 - What are integrity constraints?Ch. 7 - How do you specify a general integrity constraint?Ch. 7 - When would you usually specify primary key...Ch. 7 - How do you specify a foreign key in Oracle?Ch. 7 - Use the Internet to find information about...Ch. 7 - Use the Internet to find information about a data...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 - Write, but do not execute, the command to revoke...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 - Add the ORDER_NUM column as a foreign key in the...Ch. 7 - Ensure that the only legal values for the...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 - Write, but do not execute, the command to revoke...Ch. 7 - Create the following indexes: a. Create an index...Ch. 7 - Delete the index named TRIP_INDEX3.Ch. 7 - Write the commands to obtain the following...Ch. 7 - Add the CUSTOMER_NUM column as a foreign key in...Ch. 7 - Ensure that the only legal values for the TYPE...Ch. 7 - The maximum group size for a trip must be greater...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 - Write, but do not execute, the command to revoke...Ch. 7 - Create the following indexes: a. Create an index...Ch. 7 - Delete the OWNER_INDEX 3 index from the OWNER...Ch. 7 - Write the commands to obtain the following...Ch. 7 - Add the OWNER_NUM column as a foreign key in the...Ch. 7 - Ensure that the only legal values for the BDRMS...Ch. 7 - In Question 9, you added owner number as a foreign...

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