A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 7, Problem 6SCG
Program Plan Intro
a)
INDEX:
The “INDEX” is used to improve or increase the performance of the queries.
- It speeds up “SELCET” queries and “WHERE” clauses.
- In order to create an index it uses the “CREATE INDEX” statement in which one can specify the name of the index, specify the name of the table and the name of the columns.
Syntax for creating index:
CREATE INDEX name_of_index ON table_name;
Explanation of Solution
b)
Query to create index on “OWNER” table:
CREATE INDEX OWNER_INDEX2 ON OWNER(LAST_NAME);
E...
Explanation of Solution
c)
Query to create index on “OWNER” table:
CREATE INDEX OWNER_INDEX3 ON OWNER(STATE DESC, CITY);
Explanati...
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Students have asked these similar questions
Database
Q1:
Which one of the following INSERT statements will successfully insert a single row?
The following table has been created:
CREATE TABLE student_table (
stud_id NUMBER (6),
last_name VARCHAR2 (20),
first_name VARCHAR2 (20),
lunch_num NUMBER (4) ;
a) INSERT VALUES INTO student_table (143354, ‘Roberts’, ‘Cameron’, 6543);
b) INSERT INTO student_table COLMUNS (stud_id, last_name, lunch_num) VALUES (143352,
‘Roberts’, 5543, ‘Cameron’);
c) INSERT TO student_table (stud_id, lunch_num, first_name, last_name) VALUES (143352, 6543,
‘Cameron’, ‘Roberts’);
d) INSERT INTO student_table VALUES (143354, ‘Roberts’, ‘Cameron’, 6543);
Q2:
What does the following SQL statement display:
SELECT EMP_ID, LAST_NAME, SALARY
FROM EMPLOYEES WHERE
SALARY > (SELECT MIN (E. SALARY)
FROM EMPLOYEES E)
ORDER BY SALARY DESC;
a) Employees information who earn less money than the maximum salary
b) Employees information who earn more money than the highest employee salary
c) Employees information who earn…
CREATE TABLE DONORS (donor_id INT NOT NULL,donor_name varchar(255) NOT NULL,donor_age int,PRIMARY KEY (donor_id ));CREATE TABLE DONATIONS(pledge_id INT NOT NULL,pledge_date varchar(255) NOT NULL,amount_pledged int,Is_paid int,donor_id int,PRIMARY KEY (pledge_id ),FOREIGN KEY (donor_id) REFERENCES DONORS(donor_id));
1. Populate every relation with three rows.
Task 6:
The Car Maintenance team considered that the available maintenance tasks should also have the price information in the database. Alter the MAINTENANCE_TYPES table to include a new column named MAINTENANCE_PRICE of type FLOAT.
Alter the MAINTENANCE_TYPES table to include pricing information.
Chapter 7 Solutions
A Guide to SQL
Ch. 7 - What is a view?Ch. 7 - Which command creates a view?Ch. 7 - Prob. 3RQCh. 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. 8RQCh. 7 - Which command terminates previously granted...Ch. 7 - Prob. 10RQCh. 7 - How do you create an index? How do you create a...
Ch. 7 - Prob. 12RQCh. 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. 16RQCh. 7 - Prob. 17RQCh. 7 - Prob. 18RQCh. 7 - Prob. 19RQCh. 7 - When would you usually specify primary key...Ch. 7 - Prob. 21RQCh. 7 - Prob. 22RQCh. 7 - Prob. 23RQCh. 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. 5TDCh. 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. 9TDCh. 7 - Prob. 10TDCh. 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. 5CATCh. 7 - Create the following indexes: a. Create an index...Ch. 7 - Prob. 7CATCh. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9CATCh. 7 - Ensure that the only legal values for the TYPE...Ch. 7 - Prob. 11CATCh. 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. 5SCGCh. 7 - Prob. 6SCGCh. 7 - Delete the OWNER_INDEX 3 index from the OWNER...Ch. 7 - Write the commands to obtain the following...Ch. 7 - Prob. 9SCGCh. 7 - Ensure that the only legal values for the BDRMS...Ch. 7 - Prob. 11SCG
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- Add two columns to the EMPLOYEES table. One column, named EmpDate, contains the date of employment for each employee, and its default value should be the system date. The second column, named EndDate, contains employees date of termination.arrow_forwardHow do you indicate that a column alias should be used?arrow_forwardWhich of the following characters can be used in a table name? a. b. ( c. % d. !arrow_forward
- A new table has been requested to support tracking automated emails sent to customers. Create the table and add data as described below. Tablename: email_log Columns: emailid (numeric), emaildate (datetime), customer# (numeric) Primary key: emailid column, define as an Identity Column Add the following data rows and display resulting rows (if any errors occur, explain why the error is expected) Emaildate = current date, customer# = 1007 Emailid = specify to use the column default value, emaildate = current date, customer# = 1008 Emailid = 25, emaildate = current date, customer# = 1009arrow_forwardPerform the following tasks: a. Create an index named ITEM_INDEX1 on the ITEM_NUM column in the ORDER_LINEtable. b. Create an index named ITEM_INDEX2 on the CATEGORY column in the ITEMtable. c. Create an index named ITEM_INDEX3 on the CATEGORY and STOREHOUSE columnsin the ITEM table. d. Create an index named ITEM_INDEX4 on the CATEGORY and STOREHOUSEcolumns in the ITEM table. List categories in descending order.arrow_forwardDelete the index named ITEM_INDEX3.arrow_forward
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