Understanding Functional Dependency in DBMS
Functional dependency is a essential concept in database management structures (DBMS) that performs a crucial role in database layout, in particular in normalization. It defines the relationship among attributes, dictating how the value of one attribute uniquely determines the fee of every other. Understanding functional dependencies enables keep information consistency and avoid redundancy, ensuring an efficient database structure.
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What is Functional Dependency?
A practical dependency exists while one characteristic, or a set of attributes, uniquely determines any other characteristic. In easier phrases, in case you realize the value of one characteristic, you could are expecting the fee of another. It is denoted as:
Here, is referred to as the determinant, and is the established characteristic. This means that for every unique fee of , there's precisely one corresponding fee of .
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Types of Functional Dependencies
1. Trivial Functional Dependency
A dependency is trivial if the established characteristic is a subset of the determinant. For example, is trivial because is already a part of .
