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Primary Key and Unique Key

Primary Key is an attribute that uniquely identifies any given rows.  Primary Key can not be null. Unique Key also uniquely identifies  any given rows.  Tne difference is that Unique Key can be null....

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Difference between Primary Key, Unique Key Surrogate Key

Primary Key: A column in a table whose values uniquely identify the rows in the table. A primary key value cannot be NULL. Unique Key: Unique Keys are used to uniquely identify each row in an Oracle...

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