Search results
Results from the WOW.Com Content Network
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.
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 .
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 ...
Presidential candidate Kamala Harris and Donald Trump will go head to head for the first time in a debate Tuesday night where Americans will hear each candidate's views on various topics and policies.
There is a multi-attribute unique identifier/candidate key: "Manufacturer" and "Model". {Manufacturer country} is functionally dependent (predictable) on {Manufacturer}. {Manufacturer} is a proper subset of the {Manufacturer, Model} candidate key. {Manufacturer country} is not part of a candidate key, so it is a non-prime attribute.
The candidate's stance and policy ideas on the following topics in 100 words or less for each topic: Economy : America is more than a country; it was a place of unlimited opportunity birthed by ...
Every four years, we elect a new president to lead our nation. Also referred to as "the leader of the free world," this person is often judged and associated with how the economy is doing when ...
In database design, a composite key is a candidate key that consists of two or more attributes, [1] [2] [3] (table columns) that together uniquely identify an entity occurrence (table row). A compound key is a composite key for which each attribute that makes up the key is a foreign key in its own right.