How to solve Oracle Database Error 12712 (ora-12712)

Oracle Error Code
   ora-12712

Description
   new character set must be a superset of old character set

Cause
   When you ALTER DATABASE ... CHARACTER SET, the new character set must be a superset of the old character set. For example, WE8ISO8859P1 is not a superset of the WE8DEC.
How to Solve
   Specify a superset character set.

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Similar Errors
  ORA-12612    ORA-12615    ORA-12616    ORA-12712    ORA-12713    ORA-12714    ORA-12715  Others

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