The special uniqueness constraint in PostgreSQL is the "UNIQUE" constraint. This constraint ensures that no two rows in a table have the same values in the specified columns, essentially enforcing a unique combination of values. This constraint can be used on single or multiple columns and can be defined during table creation or added later using the ALTER TABLE command.
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Asked: 2023-05-13 00:14:01 +0000
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Last updated: May 13 '23
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