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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 61P
Textbook Problem
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Write a query to display the average number of days a book is kept during a check­out. (Figure P8.61)

FIGURE P8.61 AVERAGE DAYS KEPT

Chapter 8, Problem 61P, Write a query to display the average number of days a book is kept during a checkout. (Figure P8.61)

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;

“Round()” function:

This function is used to round a number that specified in decimal places. The format of the “Round()” function is as follows:

Syntax:

ROUND(number, decimal_places)

AVG function:

  • • It is one function of the aggregate function.
  • • This function is used to get the average of all the values from the column.
  • Syntax: SELECT AVG(column_Name) FROM table_Name;

Explanation of Solution

Query to display the average number of days a book is kept:

The query to display the average number of days a book is kept which is given below

SELECT ROUND(AVG(CHECK_IN_DATE - CHECK_OUT_DATE), 2) AS "Average Days Kept" FROM CHECKOUT;

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

Explanation:

  • • The above query is used to display the average number of days a book is kept from “CHECKOUT” table...

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Chapter 8 Solutions

Database Systems: Design, Implementation, & Management
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