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A candidate key is a minimal superkey, [1] i.e., a superkey that doesn't contain a smaller one. Therefore, a relation can have multiple candidate keys, each with a different number of attributes. [2] Specific candidate keys are sometimes called primary keys, secondary keys or alternate keys.
Retrospectively, the key was turned false if a single third party candidate won 5% or more of the national popular vote or there was a significant split in the incumbent party: for example, in 1948, Henry A. Wallace and Strom Thurmond both split from the Democrats and ran notable insurgent campaigns, turning the key false for President Harry S ...
To conform to 2NF and remove duplicates, every non-candidate-key attribute must depend on the whole candidate key, not just part of it. To normalize this table, make {Title} a (simple) candidate key (the primary key) so that every non-candidate-key attribute depends on the whole candidate key, and remove Price into a separate table so that its ...
(This rule applies only to functionally dependent attributes, as applying it to all attributes would implicitly prohibit composite candidate keys, since each part of any such key would violate the "whole key" clause.) An example of a table that fails to meet the requirements of 3NF is:
Usually one candidate key is chosen to be called the primary key and used in preference over the other candidate keys, which are then called alternate keys. A candidate key is a unique identifier enforcing that no tuple will be duplicated; this would make the relation into something else, namely a bag, by violating the basic definition of a set ...
By Jenna Goudreau Whether you're looking for the best job candidate or the most suitable partner to settle down with, finding The One can be nerve-wracking, since you don't know who else is out ...
In this example, {Manufacturer country} is the functionally dependent attribute which will be removed. Place those partial dependency-dependent attributes (i.e. {Manufacturer country}) in a relation where their corresponding determinant attributes are a candidate key (i.e. {Manufacturer}).
There, you can find candidate information down to the county. If you’re in the Louisville area, the Courier Journal has state and local election coverage, as well. Election Day is 2 weeks away.