Question

Define the following term of foreign key​

Answer 1

foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table.

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Answer 2

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. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.