Difference between Primary Key and Unique Key.

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Rajesh Goswami · Answer

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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Difference between Primary Key and Unique Key.

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