Podcast
Questions and Answers
What is the main goal of normalization in DBMS?
What is the main goal of normalization in DBMS?
Which normal form states that each table cell should hold a single value?
Which normal form states that each table cell should hold a single value?
In which normal form must all non-key attributes be fully functional dependent on the primary key?
In which normal form must all non-key attributes be fully functional dependent on the primary key?
What is the key focus of the Boyce-Codd Normal Form (BCNF)?
What is the key focus of the Boyce-Codd Normal Form (BCNF)?
Signup and view all the answers
Which normal form removes any multi-valued dependencies from a table?
Which normal form removes any multi-valued dependencies from a table?
Signup and view all the answers
What does the Fifth Normal Form (5NF) address?
What does the Fifth Normal Form (5NF) address?
Signup and view all the answers
Study Notes
Normalization in DBMS
- Normalization is the process of organizing data in a database to eliminate redundancy and dependency, ensuring data integrity and reducing anomalies during data manipulation.
- It is achieved by breaking down large tables into smaller, related tables and defining relationships between them.
Normal Forms
-
First Normal Form (1NF)
- Each table cell should hold a single value.
- Each column in a table must have a unique name.
- Entries in a column must be of the same data type.
- Each column should contain only atomic (indivisible) values.
-
Second Normal Form (2NF)
- Must be in 1NF.
- All non-key attributes are fully functionally dependent on the primary key.
- No partial dependencies are allowed.
-
Third Normal Form (3NF)
- Must be in 2NF.
- There should be no transitive dependencies.
- A non-key column should not depend on another non-key column.
-
Boyce-Codd Normal Form (BCNF)
- A stricter form of 3NF.
- Applies when there are multiple candidate keys in a table.
- Every determinant must be a candidate key.
-
Fourth Normal Form (4NF)
- Deals with multi-valued dependencies.
- Removes any multi-valued dependencies from a table.
-
Fifth Normal Form (5NF)
- Addresses cases where multiple overlapping candidate keys exist.
- Ensures that any join or union decomposition is lossless.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on the process of organizing data in a database efficiently through normalization. Understand how normalization aims to eliminate redundancy and dependency, ensuring data integrity and reducing anomalies during data manipulation. Explore different normal forms, such as First Normal Form, that address specific types of data anomalies.
