ORA-00001: unique constraint (constraint_name) violated

Error Message
ORA-00001: unique constraint (constraint_name) violated

Cause of Error
You tried to execute an INSERT or UPDATE statement that has created a duplicate value in a field restricted by a unique index.

Resolution
The option(s) to resolve this Oracle error are:

Option #1
Drop the unique constraint.

Option #2
Change the constraint to allow duplicate values.

Option #3
Modify your SQL so that a duplicate value is not created.