Data Independence: “Data Independence” refers to the ability to modify a schema definition in one level without affecting a schema definition in different level. It is a type of data transparency, which focuses for a centralised DBMS. One of the biggest advantages of databases is data independence. There are two levels of data independence, one is “Physical data independence” and the other one is “Logical data independence”.

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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).

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Chapter 2, Problem 23RQ

Program Plan Intro

Data Independence:

“Data Independence” refers to the ability to modify a schema definition in one level without affecting a schema definition in different level.

It is a type of data transparency, which focuses for a centralised DBMS.

One of the biggest advantages of databases is data independence.

There are two levels of data independence, one is “Physical data independence” and the other one is “Logical data independence”.

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