Question

Differentiate between primary and unique key.

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Answer 1

Explanation:

Primary Key is a column that is used to uniquely identify each tuple of the table. It is used to add integrity constraints to the table. Only one primary key is allowed to be used in a table. ... Unique key is a constraint that is used to uniquely identify a tuple in a table.

Answer 2

Explanation:

Primary Key is used to uniquely identify a row but a unique key is used to prevent duplicate values in a column. Existence: A table can have only one primary key but it can have multiple unique keys.

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