In normalization, what does it mean when we say a database is in "third normal form"?
- Each non-key attribute is functionally dependent on another non-key attribute.
- Each non-key attribute is functionally dependent on the primary key, and another non-key attribute.
- Each non-key attribute is functionally dependent on the primary key, and nothing else.
- Each non-key attribute is functionally dependent on the primary key, and only the primary key.
When a database is in third normal form (3NF), it means that each non-key attribute is functionally dependent on the primary key, and nothing else, thus eliminating transitive dependencies and ensuring data integrity.
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