2nf clean part2 - PowerPoint PPT Presentation
Unnormalized
Unnormalized. 1NF. Redundancy Unleashed. 2NF Raw - Part1. 2NF Raw - Part2. 2NF Clean - Part1. 2NF Clean – Part2. 3NF Clean – Part2. 3NF Clean – Part2.
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Part2
Part2
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Second Normal Form - 2NF
Second Normal Form - 2NF. It has to be the whole key. Second Normal Form (2NF). Overview. 2NF is an extension to 1NF that increases the organization in the database. A database is 2NF when all of the contained tables are 2NF.
PART2
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Chap3/part2
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Second Normal Form (2NF)
Second Normal Form (2NF) . A relation R is in 1NF, and every non-primary-key attribute is fully functionally dependent on the primary key Then R is in 2NF No Partial FDs on the PK. Third Normal Form (3NF). Relation R in 2NF, and
Normalization: 1NF, 2NF, 3NF
Normalization: 1NF, 2NF, 3NF. First normal form (1NF) – entity whose attributes have no more than one value for a single instance of that entity Any attributes that can have multiple values actually describe a separate entity, possibly an entity and relationship.
Second Normal Form (2NF)
Second Normal Form (2NF). A relation R is in 1NF, and every non-primary-key attribute is fully functionally dependent on the primary key Then R is in 2NF. No Partial FDs on PK. Lease (RNo, RName, PNo, PAddress, Start, Finish, Rent, ONo, OName) Primary Key: PNo, Start FDs:
Lab4 Part2
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