The Internet café must keep records of the users and be able to charge users for the time that they were logged onto the Internet - NSC Information Technology - Question 4 - 2016 - Paper 2

A possible change to indicate the format for time entry could be to replace the text box with a combo box, where users can select from preset time options. This would ensure that the entered time adheres to the required format and reduces the chances of user error.

Valid data refers to data that falls within the defined constraints and rules set out in the system, such as a time entry being between 0 and 24 hours. Correct data, on the other hand, is data that is accurate and aligns with the user's intended input. For example, if a user enters '25' as the time, it is valid in format but incorrect in context, as there are only 24 hours in a day.

The tables tblComputers and tblUsers can be linked by using the ComputerNumber from tblComputers as a primary key and placing it in tblUsers as a foreign key. This setup establishes a one-to-many relationship where one computer can be associated with many users.

SELECT LogoutTime
FROM tblUsers
WHERE PaymentMethod = 'Debit Card'
ORDER BY LogoutTime;

UPDATE tblUsers
SET PaymentMethod = 'Credit Card'
WHERE UserIDNo = '73110117564076';

SELECT COUNT(UserIDNo) AS CountCashIds
FROM tblUsers
WHERE PaymentMethod = 'Cash';

SELECT *
FROM tblUsers
WHERE (LoginTime > '12:00') AND (LoginDate = #2016/02/25#);

The basic information captured during an audit trail includes records of who made changes to the database, what changes were made, and when those changes occurred. This ensures accountability and helps maintain the integrity of the data.

1. Using cookies to track user behavior on websites.
2. Monitoring online activities through web analytics tools.

This process is called Data Mining, which involves analyzing large sets of data to uncover patterns and relationships.