A foreign key ties attribute(s) of an entity to the primary key of another entity, for the purpose of creating a dependency. It is used to establish and enforce a relationship between data in two tables. A relationship between two tables is created by adding a column or columns holding the primary key values of the primary table to the related table. This column becomes a foreign key in the second table. You can create a foreign key by defining a FOREIGN KEY constraint, when you create or alter a table.
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rogeriosolano
2 years, 11 months ago