A foreign key is a field (or group of fields) that uniquely identifies a given entity in a table.

Name: A foreign key is a field (or group of fields) that uniquely identifies a given entity in a table.
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A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table, not necessarily a given entity in a table. It is used to establish and enforce a link between the data in two tables.

A Foreign Key Is a Field (Or Group of Fields)