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A Guide to SQL

9th Edition
Philip J. Pratt
Publisher: Course Technology Ptr
ISBN: 9781111527273
Chapter 4, Problem 14RQ
Textbook Problem
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What is a subquery?

Explanation of Solution

Subquery:

Subquery means one query is placed inside with another query.

  • The inner query is called a subquery.
  • The subquery is calculated first.
    • After the subquery has been determined and the outer query can apply the results of the subquery.

Example:

The example for subquery is given below:

SELECT ORDER_NUMBER FROM ORDER_LINE WHERE BOOK_NUMBER IN(SELECT BOOK_NUMBER FROM BOOKS WHERE CATEGORY = 'CE');

Explanation:

The above query is used to list the order number using subquery...

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Chapter 4 Solutions

A Guide to SQL
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Ch. 4 - How do you sort data in descending order?Ch. 4 - What are the SQL aggregate functions?Ch. 4 - How do you avoid including duplicate values in a...Ch. 4 - What is a subquery?Ch. 4 - How do you group data in an SQL query?Ch. 4 - When grouping data in a query, how do you restrict...Ch. 4 - How do you find rows in which a particular column...Ch. 4 - Use the Internet to research the SQL [charlist]...Ch. 4 - List the item number, description, and price for...Ch. 4 - List all rows and columns for the complete ORDERS...Ch. 4 - List the names of customers with credit limits of...Ch. 4 - List the order number for each order placed by...Ch. 4 - List the number and name of each customer...Ch. 4 - List the item number and description of each item...Ch. 4 - List the item number, description, and number of...Ch. 4 - List the item number, description, and on-hand...Ch. 4 - List the item number, description, and on-hand...Ch. 4 - Use the IN operator to list the item number and...Ch. 4 - Find the number and name of each customer whose...Ch. 4 - List all details about all items. Order the output...Ch. 4 - List all details about all items. Order the output...Ch. 4 - How many customers have balances that are more...Ch. 4 - Find the total of the balances for all customers...Ch. 4 - List the item number, description, and on-hand...Ch. 4 - What is the price of the least expensive item in...Ch. 4 - What is the item number, description, and price of...Ch. 4 - List the sum of the balances of all customers for...Ch. 4 - List the sum of the balances of all customers for...Ch. 4 - List the item number of any item with an unknown...Ch. 4 - List the item number and description of all items...Ch. 4 - TAL Distributors is considering discounting the...Ch. 4 - List the last name of each guide that does not...Ch. 4 - List the trip name of each trip that has the type...Ch. 4 - List the trip name of each trip that has the...Ch. 4 - List the trip name of each trip that has the type...Ch. 4 - List the customer number, customer last name, and...Ch. 4 - Repeat Exercise 5 and sort the records by state in...Ch. 4 - How many trips are in the states of Maine (ME) or...Ch. 4 - How many trips originate in each state?Ch. 4 - How many reservations include a trip price that is...Ch. 4 - How many trips of each type are there?Ch. 4 - Colonial Adventure Tours calculates the total...Ch. 4 - Find the name of each trip containing the word...Ch. 4 - List the guides last name and guides first name...Ch. 4 - What is the average distance and the average...Ch. 4 - Display the different seasons in which trips are...Ch. 4 - List the reservation IDs for reservations that are...Ch. 4 - What is the longest distance for a biking trip?Ch. 4 - For each trip in the RESERVATION table that has...Ch. 4 - How many current reservations does Colonial...Ch. 4 - List the reservation ID and trip ID for all trips...Ch. 4 - List the owner number, last name, and first name...Ch. 4 - List the complete LOCATION table (all rows and all...Ch. 4 - List the last name and first name of every owner...Ch. 4 - List the last name and first name of every owner...Ch. 4 - List the location number and unit number for every...Ch. 4 - List the location number and unit number for every...Ch. 4 - List the unit number for every condo with two...Ch. 4 - List the condo ID for every condo with a condo fee...Ch. 4 - List the unit number for every condo in location...Ch. 4 - Labor is billed at the rate of 35 per hour. List...Ch. 4 - List the owner number and last name for all owners...Ch. 4 - List the location number, unit number, square...Ch. 4 - How many one-bedroom condos are located at each...Ch. 4 - Calculate the total condo fees Solmaris receives...Ch. 4 - There are two ways to create the query in Step 11....Ch. 4 - What WHERE clause would you use to find all...

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