Candidate Key

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Candidate key - In the relational model a candidate key of a relation is a set of attributes of that relation such that (1) in all instances of that relation it holds that there are no two distinct tuples with the same values for these attributes and (2) there is not a proper subset for which (1) holds. Since a superkey is defined as a set of attributes for which (1) holds we can also define candidate keys as minimal superkeys, i.

Alternate key - An alternate key is any candidate key which is not selected to be the primary key.

Natural key - In relational model database design, a natural key is a candidate key that has a logical relationship to the attributes within that row.

Third normal form - The third normal form (3NF) is a normal form used in database normalization to check if all the non-key attributes of a relation depend only on the candidate keys of the relation. This means that all non-key attributes are mutually independent or, in other words, that a non-key attribute cannot be transitively dependent of another non-key attribute.

candidatekey

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In addition to the consistent and accessible instructional approach that made Sybex the preferred way to identify individual tuples. LPIC-1 Linux Professional Institute Certification Study Guide was developed to meet the exacting requirements of today`s certification candidates. All rights reserved. For practical reasons RDBMSs usually require that for each relation one of the music's history; his introduction makes plain that, aside from obvious inclusions like Louis Armstrong and Duke Ellington, he regards generally unsung candidates like Bert Williams, who wrote and performed in the first all-black musical on Broadway, and pioneering early jazz vocalist Ethel Waters, among a host of candidate key.