ORA-12704: character set mismatch

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ORA-12704: character set mismatch
Cause: One of the following:
- The string operands(other than an nlsparams argument) to an operator or
built-in function do not have the same character set.
- An nlsparams operand is not in the database character set.
- String data with character set other than the database character set ispassed to a
built-in function not expecting it.
- The second argument to CHR() or CSCONVERT() is not CHAR_CS or NCHAR_
CS.
- A string expression in the VALUES clause of an INSERT statement, or the SET
clause of an UPDATE statement, does not have the same character set as the
column into which the value would be inserted.
- A value provided in a DEFAULT clause when creating a table does not have the
same character set as declared for the column.
- An argument to a PL/SQL function does not conform to the character set
requirements of the corresponding parameter.
Action: None