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Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482

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Chapter
Section
BuyFindarrow_forward

Database Systems: Design, Implemen...

12th Edition
Carlos Coronel + 1 other
Publisher: Cengage Learning
ISBN: 9781305627482
Chapter 8, Problem 67P
Textbook Problem
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Write a query to display the lowest average cost of books within a subject and the highest average cost of books within a subject. (Figure P8.67)

FIGURE P8.67 LOWEST AND HIGHEST AVERAGE SUBJECT COSTS

Chapter 8, Problem 67P, Write a query to display the lowest average cost of books within a subject and the highest average

Program Plan Intro

SELECT statement:

It is used to retrieve information from the table or database. The syntax for the “SELECT” statement is given below:

Syntax:

SELECT * FROM table_Name;

MIN function:

  • • It is one of the aggregate functions. This function is used to get the minimum value from the column.
  • Syntax: SELECT MIN(column_Name) FROM table_Name;

MAX function:

  • • It is one of the aggregate functions. This function is used to get the maximum value from the column.
  • Syntax: SELECT MAX(column_Name) FROM table_Name;

“GROUP BY” Clause:

The “GROUP BY” clause is used to group the result of a “SELECT” statement done on a table where the tuple values are similar for more than one column

Syntax:

SELECT expression1, expression2, expression_n, aggregate_function (expression) FROM table_name WHERE conditions GROUP BY expression1, expression2, expression_n;

Explanation of Solution

Query to display the minimum and maximum average cost from “BOOK” table:

The query to display the minimum average cost and maximum average cost from “BOOK” table is given below:

SELECT Min (AVERAGE_COST) AS "Lowest Avg Cost", Max (AVERAGE_COST) AS "Highest Avg Cost" FROM (SELECT BOOK_SUBJECT, Round (Avg (BOOK_COST), 2) AS AVERAGE_COST FROM BOOK GROUP BY BOOK_SUBJECT);

The above query was executed using the tool “Access 2013”.

Explanation:

  • • The above query is used to display the lowest and highest average cost from “BOOK” table within a book subject by using subquery
    • ○ From the given query, the lowest average cost is computed by using “MIN” function and its computed column is represented by “Lowest Avg Cost”.
    • ○ The highest average cost is computed by using “MAX” function and its computed column is represented by “Highest Avg Cost”...

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Chapter 8 Solutions

Database Systems: Design, Implementation, & Management
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