Entity Relational (ER) Diagram:

The following figure illustrates the ER Diagram for given business rules using Crow’s Foot notation:

Explanation:

The above ERD, contains several entities such as “VOLUNTEER”, “ASSIGNMENT”, “LIST”, “ACTION”, “ITEM”, “PACKAGE_CONTENT” and “PACKAGE”. Each entity has its own attributes.

A volunteer can have assignment for several tasks. Similarly, a task can be done by several volunteers. Hence the relationship between the entities “VOLUNTEER” and “ACTION” is M: N...

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Chapter 4, Problem 6P

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Write .php file that saves car booking and displays feedback. There are 2 buttons, which are <Book it> <Select a date>. <Select a date> button gets an input from the user, start date and an end date. Book it button can be pressed only if the start date and ending date are chosen by the user. If successful, it books cars for specific dates, with bookings saved. Booking should be in the .json file which contains all the bookings, and have the following information: Start Date. End Date. User Email. Car ID. If the car is already booked for the selected period, a failure message should be displayed, along with a button to return to the homepage. In the booking.json file, if the Car ID and start date and end date matches, it fails Use AJAX: Save bookings and display feedback without page refresh, using a custom modal (not alert).

Write .php file with the html that saves car booking and displays feedback. Booking should be in the .json file which contains all the bookings, and have the following information: Start Date. End Date. User Email. Car ID. There are 2 buttons, which are <Book it> <Select a date> Book it button can be pressed only if the start date and ending date are chosen by the user. If successful, book cars for specific dates, with bookings saved. If the car is already booked for the selected period, a failure message should be displayed, along with a button to return to the homepage. Use AJAX: Save bookings and display feedback without page refresh, using a custom modal (not alert). And then add an additional feature that only free dates are selectable (e.g., calendar view).

Chapter 4 Solutions

Database Systems: Design, Implementation, Management, Loose-leaf Version

Ch. 4 - Prob. 1RQ Ch. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQ Ch. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQ Ch. 4 - Prob. 7RQ Ch. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQ Ch. 4 - Discuss two ways in which the 1:M relationship...

Ch. 4 - Prob. 13RQ Ch. 4 - Prob. 14RQ Ch. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQ Ch. 4 - Prob. 18RQ Ch. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQ Ch. 4 - Prob. 1P Ch. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4P Ch. 4 - Prob. 5P Ch. 4 - Prob. 6P Ch. 4 - Prob. 7P Ch. 4 - Prob. 8P Ch. 4 - Prob. 9P Ch. 4 - Prob. 10P Ch. 4 - Prob. 11C

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Solution Summary: The author illustrates the Entity Relational (ER) Diagram for given business rules using Crow’s Foot notation: Each entity has its own attributes.

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Chapter 4 Solutions