DIFFERENCE BETWEEN PRIMARY KEY AND UNIQUE KEY.

Monaj Singh

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  1. Rajesh Goswami

    Post:85

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    Difference between Primary Key and Unique 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 table. There can be one and only one row for each unique key value.

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