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primary key

The column (field) in a relational database that uniquely identifies the row in the table. For example, account number is often a primary key. A "composite primary key" or "super key" is made up of two or more columns such as account number + name. See candidate key.

candidate key

One or more columns (fields) in a relational database that can uniquely identify a row in the table. If there are two or more candidate keys, only one is selected as the "primary." See primary key.

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