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

One way to indicate the format for entering time is to use two combo boxes, one for hours and another for minutes. This change can assist users in selecting appropriate values without the need for them to remember or adhere to specific input formats.

Valid data refers to data that adheres to the defined rules and constraints, such as format and acceptable values. For instance, in the GUI, an acceptable hour for 'Time' must be within the 0 to 24 range. On the other hand, correct data means that the data accurately represents the real-world entity or situation it is supposed to describe. For example, entering '25:00' is valid (in terms of format), but it is not correct since there is no 25th hour in a day.

The tables tblComputers and tblUsers can be linked by using the ComputerNumber field from tblComputers as the primary key and placing it as a foreign key in tblUsers. This setup will enable each computer to be associated with multiple users, establishing the one-to-many relationship.

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 changes made to the database, the time when changes were made, the specific user who made those changes, and details of the data that was altered.

1. Using credit cards or loyalty cards when purchases are made.
2. Tracking user behavior when browsing the Internet or selecting webpages.

This process is known as data mining.