10 Questions
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.
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?
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.
Functional dependencies play a crucial role in database normalization, which is the process of organizing data in a database to reduce data redundancy and improve data integrity.
Define data integrity in the context of a database.
Data integrity is the overall completeness, accuracy, and consistency of data over its entire lifecycle in a database.
What does a functional dependency in a database table refer to?
The relationship between attributes where the value of one attribute determines the value of another
In the context of a database table of 'orders', what does 'Order ID' functionally determine?
Customer ID
What is the role of functional dependencies in database normalization?
To reduce data redundancy and improve data integrity
What is data integrity in the context of a database?
The overall completeness, accuracy, and consistency of data over its entire lifecycle
In formal terms, what does a functional dependency X->Y indicate?
Attribute set X functionally determines attribute set Y
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.
Test your knowledge of functional dependency in DBMS with this quiz. Explore the concept of determinants and dependents in database tables and enhance your understanding of how attributes relate to each other within a database system.
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