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What is functional dependency in DBMS?
What is functional dependency in DBMS?
Functional dependency in DBMS refers to the relationship between attributes in a database table, where the value of one attribute determines the value of another.
Give an example of functional dependency in a 'orders' table.
Give an example of functional dependency in a 'orders' table.
For a 'orders' table, the attribute 'Order ID' functionally determines the attribute 'Customer ID'.
What is the role of functional dependencies in maintaining data integrity?
What is the role of functional dependencies in maintaining data integrity?
Functional dependencies are used to ensure data integrity and maintain the consistency of a database by reducing data redundancy and improving data integrity.
Explain the role of functional dependencies in database normalization.
Explain the role of functional dependencies in database normalization.
Define data integrity in the context of a database.
Define data integrity in the context of a database.
What does a functional dependency in a database table refer to?
What does a functional dependency in a database table refer to?
In the context of a database table of 'orders', what does 'Order ID' functionally determine?
In the context of a database table of 'orders', what does 'Order ID' functionally determine?
What is the role of functional dependencies in database normalization?
What is the role of functional dependencies in database normalization?
What is data integrity in the context of a database?
What is data integrity in the context of a database?
In formal terms, what does a functional dependency X->Y indicate?
In formal terms, what does a functional dependency X->Y indicate?
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Study Notes
Functional Dependency in DBMS
- A functional dependency exists between two attributes in a database table when the value of one attribute (determinant) determines the value of another attribute (dependent).
- In a database table of "orders", the "Order ID" functionally determines the "Customer ID", meaning a given "Order ID" corresponds to a unique "Customer ID" that cannot be changed.
- Functional dependencies ensure data integrity and maintain consistency in a database.
- Functional dependencies play a crucial role in database normalization, which aims to reduce data redundancy and improve data integrity.
Data Integrity
- Data integrity refers to the overall completeness, accuracy, and consistency of data throughout its entire lifecycle.
- It is maintained by ensuring the consistency and accuracy of data through functional dependencies and database normalization.
Formal Definition
- A functional dependency exists between two sets of attributes, X and Y, if the value of X determines the value of Y. This is denoted as X → Y.
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