Questions and Answers
Which of the following is true about normalization theory?
Normalization theory is based on the observation that relations with certain properties are more effective in inserting, updating, and deleting data.
Which normal form requires that there is no transitive dependency between nonkey attributes?
Third Normal Form (3NF)
Which normal form requires that all determinants are candidate keys?
Boyce-Codd Normal Form (BCNF)
Which normal form allows for a functional dependency of nonkey attributes on the primary key and atomic values only?
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What are functional dependencies used for in relational designs?
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Study Notes
Normalization Theory
- Normalization theory aims to minimize data redundancy and dependency in relational databases.
Normal Forms
- First Normal Form (1NF): All attributes must be atomic (cannot be divided further).
- Second Normal Form (2NF): No transitive dependency between non-key attributes (no indirect dependencies).
- Third Normal Form (3NF): All determinants are candidate keys (no transitive dependencies).
- Boyce-Codd Normal Form (BCNF): Allows functional dependency of non-key attributes on the primary key and atomic values only.
Functional Dependencies
- Functional dependencies are used in relational designs to establish relationships between attributes.
- They are essential in normalization to minimize data redundancy and improve data integrity.
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