Question

A primary key is a composition of​

Answer 1

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Your answer : One or more fields (columns) whose values uniquely identify each record .

Answer 2

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A composite primary key is a primary key consisting of more than one column. ... A foreign key is a column, or combination of columns, that contain values that are found in the primary key of some table (including, possibly, itself). A foreign key may be null, and almost always is not unique.