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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.
Georgia In 2016 Georgia required a third-party presidential candidate to produce 7,500 signatures of registered voters to gain ballot access. [22] The 7,500 number was imposed by Federal District Court Judge Richard Story in a March 17, 2016, ruling against the state that their requirement of signatures equaling at least 1% of the total number ...
In relational database management systems, a unique key is a candidate key. All the candidate keys of a relation can uniquely identify the records of the relation, but only one of them is used as the primary key of the relation. The remaining candidate keys are called unique keys because they can uniquely identify a record in a relation.
The aggregate number of wasted votes was an unprecented 46.33 percent (14,545,438). As a result, Erdoğan 's AKP gained power, winning more than two-thirds of the seats in the Parliament with just 34.28 percent of the vote, with only one opposition party ( CHP , which by itself failed to pass threshold in 1999) and 9 independents.
For referential integrity to hold in a relational database, any column in a base table that is declared a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. [2] In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table.
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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 ...
The Keys to the White House, also known as the 13 keys, is a prediction system for determining the outcome of presidential elections in the United States.It was developed by American historian Allan Lichtman and Russian geophysicist Vladimir Keilis-Borok in 1981, adapting methods that Keilis-Borok designed for earthquake prediction.