ORA-02437: cannot validate (string.string) - primary key violated - Oracle Database 12c Error Msg

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In this video we are going to see how to fix below Oracle Database 12c Error Message.

Cause: attempted to validate a primary key with duplicate values or null values.
Action: remove the duplicates and null values before enabling a primary key.

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  2. ORA-02437: cannot validate (string.string) - primary key violated
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