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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 ...
A candidate key, or simply a key, of a relational database is any set of columns that have a unique combination of values in each row, with the additional constraint that removing any column could produce duplicate combinations of values. A candidate key is a minimal superkey, [1] i.e., a superkey that doesn't contain a smaller one. Therefore ...
This is a list of some of the more commonly known problems that are NP-complete when expressed as decision problems. As there are thousands of such problems known, this list is in no way comprehensive. Many problems of this type can be found in Garey & Johnson (1979).
Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. The difference is that a database query language attempts to give factual answers to factual questions, while an information retrieval query language attempts to find documents containing information that is relevant to an area of inquiry.
Super key may refer to: Super key (keyboard button), modifier key on keyboards; Superkey, database relation This page was last edited on 14 ...
There are some key readjustments that need to take place," said Goldstein. "I would like to see that take place from readjusting China's currency." Original article source: ...
Lynda Carter is the ultimate cover girl for the December 2024 edition of Harper's Bazaar Vietnam.. The original Wonder Woman actress, 72, sat down with model Coco Rocha for an interview with the ...
France's government collapsed Wednesday after Prime Minister Michel Barnier was forced out in a no-confidence vote in Parliament, reigniting a summertime political crisis for the country as it ...