Technical - What is 3rd level of normalization ?

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What is 3rd level of normalization ?

Total Answers and Comments: 4

Last Update: December 23, 2006

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November 03, 2005 02:46:07

Pintu Kumar Singh

RE: What is 3rd level of normalization ?

Third Normal Form (3NF): No duplicate information is permitted. So for example if two tables both require a common field this common field information should be separated into a different table.

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May 05, 2006 15:46:40

Abhishek Mukherjee

RE: What is 3rd level of normalization ?

A relation is in 3 NF if it is in 2 NF and no NONKEY(Not Primary Key) attribute is functionally dependent on any other NONKEY attribute.

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October 23, 2006 11:29:17

thumatinagaraju

Member Since: October 2006 Contribution: 26

RE: What is 3rd level of normalization ?

in 3rd normal form every non-key column must be refered by the primary key column .. this is the third normal form.

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December 23, 2006 03:54:14

abhishek mittal

RE: What is 3rd level of normalization ?

3rd level of normalization is basically to remove the redundancy of data & to preserve the functional dependencies.for a relation with set of FDs 'F' its in 3rd NF wrt closure of F if satisfies anyone of the following 3 conditions:-

1) A -> B should be the trivial FD.

2) for any FD A -> B A should be the super key of relation.

3) for any FD A -> B (B-A) should be contained in the candidate key of relation.

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