Answered: Rewrite the above description using the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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3. Rewrite the above description using the structured approach described in this chapter.
Resolve the identified ambiguities in an appropriate way.

An automated ticket-issuing system sells rail tickets. Users select their destination and
input a credit card and a personal identification number. The rail ticket is issued and them
credit card account charged. When the user presses the start button, a menu display of
potential destinations are activated, along with a message to the user to select a destination.
Once a destination has been selected, users are requested to input their credit card. Its
validity is checked and the user is then requested to input a personal identifier. When the
credit transaction has been validated; the ticket is issued.

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