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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.
Example Condorcet method voting ballot. Blank votes are equivalent to ranking that candidate last. A Condorcet method (English: / k ɒ n d ɔːr ˈ s eɪ /; French: [kɔ̃dɔʁsɛ]) is an election method that elects the candidate who wins a majority of the vote in every head-to-head election against each of the other candidates, whenever there is such a candidate.
The Condorcet winner is also called a majority winner, a majority-preferred candidate, [3] [4] [5] a beats-all winner, or tournament winner (by analogy with round-robin tournaments). A Condorcet winner may not necessarily always exist in a given electorate: it is possible to have a rock, paper, scissors -style cycle, when multiple candidates ...
Key Features of 401(k) There is a good chance that if you are even remotely considering retirement, someone has mentioned a 401(k) plan to you. These employer-sponsored plans enable employees to ...
9. Set up an annuity. An annuity can be a good place to set up reliable income. With a typical annuity, you make payments to an insurance company, which will provide you with a stream of income in ...
A candidate key (or minimal superkey) is a superkey that can't be reduced to a simpler superkey by removing an attribute. [ 3 ] For example, in an employee schema with attributes employeeID , name , job , and departmentID , if employeeID values are unique then employeeID combined with any or all of the other attributes can uniquely identify ...
With the upcoming presidential election, many people are worried about what will happen to Social Security and which presidential candidate would better protect the program.
A table is in 4NF if and only if, for every one of its non-trivial multivalued dependencies X Y, {X, Y} is a superkey—that is, the combination of all attributes in X and Y is either a candidate key or a superset thereof.