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Input Controls

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Input controls

Computer input devices provide users with the ability to control hardware and software functions. Input devices also pass data to the computer. This data can come in many forms, including text, images and audio. There are a lot of input devices you can use with a computer, but they all tend to perform a similar set of functions. Understanding input functions is not typically difficult and is key to understanding how computers work generally.
At the most basic level, an input device is for passing data to a computer system. The most basic forms of input commonly used with computers therefore include portable disk drives and CDs. Portable storage devices such as external hard drives and USB memory sticks store various types of data, contained within digital files. When connected to a computer, these can act as input devices, allowing users to copy files onto the computer system.
The keyboard is one of the most frequently used computer input devices. Keyboards are connected to PCs through cables or built-in to the same hardware item in cases such as laptops. Users can input text using their keyboard for functions such as word processing, emailing and carrying out Internet activities including entering website addresses, performing searches and emailing. With tablet PCs and touchscreen smartphones, users enter text using the screen, which acts as both an input and output device.
Audit trail
Data security
Records retention policy
Encrypted – encryption

Types of Data Integrity Issues

In this section, we will identify some of the common data integrity issues. We will use the following relational schema for our discussions: •The sales fact table has a foreign key product_id that points to the primary key product_id in the product dimension table.
•The product dimension table has a foreign key product_class_id that points to the primary key product_class_id in the product_class dimension table.

Figure 1. Relational schema
Referential Integrity
Referential integrity (RI) issues are the most common of data integrity issues in relational databases. An RI error is essentially a violation of a foreign key–primary key constraint. For example: •The sales fact table has a record with a product_id that does not exist in the product dimension table.
•The product dimension table has a product_class_id that does not exist in the product_class dimension table.
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