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A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
Here ID serves as the primary key in the table 'Author', but also as AuthorID serves as a Foreign Key in the table 'Book'. The Foreign Key serves as the link, and therefore the connection, between the two related tables in this sample database. In a relational database, a candidate key uniquely identifies each row of data values in a database ...
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A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key [citation needed]) in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data, unlike a natural (or business) key. [1]
PHOENIX — At least one person is dead and multiple people are injured after a crash Monday between two airplanes at an Arizona airport, authorities said, the latest incident at a time of ...
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A joint venture between U.S. electric pickup and SUV maker Rivian and Volkswagen is in talks with other automakers about supplying their software and electrical architecture, a senior Rivian ...
The article talks about the foreign key referencing a Candidate key in the referenced table. I dont think that this is entirely accurate. The foreign key must reference a Superkey, but there is no requirement for that Superkey to also be a Candidate key. Candidate key is a smallest possible superkey, and I'm pretty sure a foreign key can ...