Functional dependency is important in database normalization, allowing for smooth transition between values without disruption. It is essential in relational databases and allows for easy association of data types. An example is using a government-issued identification number for identification and accessing information. Functional dependency allows users to enter a value to retrieve desired information, making it easier to organize appointments with clients. The structure may vary, but the end result is always the same: one value correlates to another, allowing for easy access to relevant data.
As an important component in database normalization, database or functional dependency is a situation where a value allows smooth transition to the next value in the sequence without any kind of disruption. When this type of situation occurs, the flow of information within the database proceeds without any kind of delay or problem and the integrity of the data itself is maintained. Functional dependency is essential in the creation and operation of relational databases, as the process involves easily associating a value or data type with other relevant values.
One of the easiest ways to understand how functional addiction works is to consider using a government-issued identification number, such as the Social Security number that is routinely issued to every citizen of the United States. By using this number as a means of identification, it is possible for employers to access information about the holder of that number; Prospective lenders and other creditors can use the number to access relevant financial information about an applicant, and the number provides access to information such as taxes assessed and paid, income levels from one year to the next, and to calculate government-supported retirement benefits that the individual will eventually be able to enjoy after leaving the workforce. In many cases, employers may actually use this same number as a primary employee identification number or some portion of the number as a relational tool to access the rest of the employee’s electronic file.
As part of database development and operation, functional dependency serves to allow users to enter a value which in turn can be used to retrieve the desired information. For example, a salesperson could enter the value of a business name to retrieve all contact records associated with a business customer. Similarly, the salesperson who is planning a sales trip can enter a city name as a value as a means of accessing the names and contact information of all customers who are located near his destination, making it easier to organize appointments with such clients.
While the exact structure of how a system provides functional dependency can vary based on the application involved, the end result is always the same. One value correlates to another, allowing you to access the information you need with relative ease. With so many records kept in databases rather than relying on the old paper file method, this type of relational dependency goes a long way in locating and using the relevant data.
Protect your devices with Threat Protection by NordVPN
