I have a db in AL24UTFFSS for both database charset and national
charset data in NVARCHAR fields. I would like to convert these all to
UTF8. When I try using "alter database character set UTF8" I get this
error:

ORA-12712: new character set must be a superset of old character set

Can anyone tell me how to do this conversion? All user data is
currently in plain English, so there shouldn't be any problem with data
corruption.

Thanks
  -Matt

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