What is meant by Functional Dependencies?ARelationships between attributes that determine the values ​​of other attributesBUnexpected error in the databaseCWays to reduce data redundancy

Functional Dependencies refer to the relationships between attributes that determine the values ​​of other attributes. In the context of databases, they are a key element in the normalization process, which aims to reduce data redundancy and improve the integrity of the data.

Here's a step-by-step explanation:

1. In a database, attributes are the data points that describe the characteristics of an entity. For example, in a database table about students, the attributes might include student ID, name, age, major, etc.

2. A functional dependency exists when the value of one attribute (or a group of attributes) determines the value of another attribute. For example, in the students table, the student ID might determine the name of the student. This is expressed as student ID -> name.

3. These dependencies are used in the process of normalization, which is a method for organizing data in a database to reduce redundancy and improve data integrity.

4. Redundancy happens when the same piece of data is held in two separate places. It's a problem because it can cause inconsistencies - if you update the data in one place but forget to update it in the other, then your database will have conflicting information.

5. By identifying functional dependencies, you can restructure your database to ensure that each piece of information is stored in only one place, reducing redundancy and improving data integrity.