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A Guide to SQL

9th Edition
Philip J. Pratt
Publisher: Course Technology Ptr
ISBN: 9781111527273
Chapter 5, Problem 2RQ
Textbook Problem
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When must you qualify names in SQL commands? How do you qualify a column name?

Program Plan Intro

SQL:

  • SQL stands for “Structured Query Language”.
  • The current version of SQL is “ANSI SQL – 92”.
  • SQL is not a programming language. It is text-based and it is also called as data sublanguage.
    • In order to get SQL as a complete programming language, it should be included in scripting languages like Java, C#, and so on.
  • It contains constructs which are used to define and process database. They are executed using DBMS-supplied command prompt.
  • Some of the DBMS products provide GUI tools in order to perform tasks are as follows:
    • SQL Server
    • Oracle Database
    • MySQL

Explanation of Solution

 Qualifying names:

  • While joining the tables, if the column name from one table matches with another table then that column name should be qualified in order to avoid confusion.
  • This is done by giving the table name followed by dot (.) and by column name.

The format to qualify column names is:

Table_Name.column_Name

 Example:

 Consider two tables name “EMPLOYEE” and “SALARY”...

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Chapter 5 Solutions

A Guide to SQL
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Ch. 5 - Which rows are included in an inner join? What...Ch. 5 - Which rows are included in a left outer join? What...Ch. 5 - Which rows are included in a right outer join?...Ch. 5 - What is the formal name for the product of two...Ch. 5 - Use the Internet to find definitions for the terms...Ch. 5 - For each order, list the order number and order...Ch. 5 - For each order placed on October 15, 2015, list...Ch. 5 - For each order, list the order number, order date,...Ch. 5 - Use the IN operator to find the number and name of...Ch. 5 - Repeat Exercise 4, but this time use the EXISTS...Ch. 5 - Find the number and name of each customer that did...Ch. 5 - For each order, list the order number, order date,...Ch. 5 - Repeat Exercise 7, but this time order the rows by...Ch. 5 - Use a subquery to find the rep number, last name,...Ch. 5 - Repeat Exercise 9, but this time do not use a...Ch. 5 - Find the number and name of each customer that...Ch. 5 - List the item number, description, and category...Ch. 5 - List the order number and order date for each...Ch. 5 - List the order number and order date for each...Ch. 5 - List the order number and order date for each...Ch. 5 - List the order number and order date for each...Ch. 5 - List the order number and order date for each...Ch. 5 - List the item number, description, unit price, and...Ch. 5 - If you used ALL in Exercise 18, repeat the...Ch. 5 - For each rep, list the customer number, customer...Ch. 5 - For each reservation, list the reservation ID,...Ch. 5 - For each reservation for customer Ryan Goff, list...Ch. 5 - List the trip name of each trip that has Miles...Ch. 5 - List the trip name of each trip that has the type...Ch. 5 - For each reservation that has a trip date of July...Ch. 5 - List the reservation ID, trip ID, and trip date...Ch. 5 - Repeat Exercise 6, but this time use the EXISTS...Ch. 5 - Find the guide last name and guide first name of...Ch. 5 - Repeat Exercise 8 but use aliases for the table...Ch. 5 - List the trip IDs and trip names (or each pair of...Ch. 5 - Find the trip name of all reservations for hiking...Ch. 5 - List the number and name of each customer that...Ch. 5 - List the number and name of each customer that...Ch. 5 - Find the trip ID and trip name for each trip whose...Ch. 5 - Find the trip ID and trip name for each trip whose...Ch. 5 - Display the trip ID, trip name, and reservation ID...Ch. 5 - Repeat Exercise 8 but list the guide name only...Ch. 5 - Repeat Exercise 10, but this time list only hiking...Ch. 5 - For every condo, list the location number, unit...Ch. 5 - For every completed or open service request for...Ch. 5 - For every service request for janitorial work,...Ch. 5 - List the first and last names of all owners who...Ch. 5 - Repeat Exercise 4, but this time use the EXISTS...Ch. 5 - List the unit numbers of any pair of condos that...Ch. 5 - List the square footage, owner number, owner last...Ch. 5 - Repeat Exercise 7, but this time include only...Ch. 5 - List the location number, unit number, and condo...Ch. 5 - List the location number, unit number, and condo...Ch. 5 - List the location number, unit number, and condo...Ch. 5 - Find the service ID and condo ID for each service...Ch. 5 - Find the service ID and condo ID for each service...Ch. 5 - List the condo ID, square footage, owner number,...Ch. 5 - Repeat Exercise 14, but this time be sure each...Ch. 5 - Repeat Exercise 15 using a different SQL command...

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