Podcast Beta
Questions and Answers
What is the first rule of normalizing data?
Functional dependency refers to the relationship between attributes in a table.
True
Define Full Functional Dependency.
A condition where one attribute is fully dependent on another and not on any subset of that attribute.
What requires a table to be in Second Normal Form (2NF)?
Signup and view all the answers
What is the goal of normalization?
Signup and view all the answers
What does Third Normal Form (3NF) ensure?
Signup and view all the answers
Boyce-Codd Normal Form (BCNF) handles a case where there might be two primary keys.
Signup and view all the answers
What is required for a relation to be in Fourth Normal Form (4NF)?
Signup and view all the answers
What is another name for Fifth Normal Form?
Signup and view all the answers
Study Notes
Normalization
- Refers to organizing data to minimize redundancy in relational database design.
- Eliminates repeated data.
- Removes redundant data.
- Eliminates update, delete, and insert anomalies.
- Follows a series of recommended steps to eliminate redundancy and update anomalies in database design.
Functional Dependency
- Describes the relationship between attributes (columns) in a table.
- Classifications:
Full Functional Dependency
- Indicates that if A and B are attributes of a table, B is fully functionally dependent on A if B is functionally dependent on A, but not on any proper subset of A.Partial Functional Dependency
- Indicates that if A and B are attributes of a table, B is partially dependent on A if some attributes can be removed from A, and yet the dependency still holds.
Transitive Functional Dependency
- Is a condition where A, B and C are attributes of a table such that if A is functionally dependent on B and B is functionally dependent on C then C is transitively reliant on A via B.
Normal Forms
- First Normal Form (1NF)
- States that the domain of an attribute must include only atomic values and that the value of any attribute in a row must be a single value from the domain of that attribute.
- Second Normal Form (2NF)
- A relation in 2NF if and only if it is in 1NF and every non-key attribute is fully dependent on the primary key.
- Eliminates partial dependencies.
- Third Normal Form (3NF)
- A relation is in 3NF if and only if it is in 2NF and every non-key attribute is non-transitively dependent on the primary key.
- Boyce-Codd Normal Form (BCNF)
- Named after Ry Boyce and Edgar Codd.
- Handles a problem with an entity that might have two primary keys.
- Fourth Normal Form (4NF)
- A relation is in 4NF if and only if a multi-valued dependency (MVD) exists in a table, then all attributes of the table are also functionally dependent on A.
- Fifth Normal Form (5NF)
- Also called the projection-join normal form (PJ/NF).
- A relation is in 5NF if and only if every join dependency in the relation can be represented as a join of projections of the relation.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers key concepts related to database normalization and functional dependency. You will explore the principles of organizing data to minimize redundancy and the different types of functional dependencies. A deep understanding of these concepts is crucial for effective relational database design.
