ORA-12704 character set mismatch

I got “ORA-12704 character set mismatch ”  error in Oracle database.

ORA-12704 character set mismatch

Details of error are as follows.

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 is passed 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: Strings declared with NCHAR or NCHAR VARYING do not interoperate with strings declared with CHAR or VARCHAR2. Use TRANSLATE() function to explicitly convert one to the other.

character set mismatch

This ORA-12704 errors are related with the 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 is passed 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.

To solve this error, Strings declared with NCHAR or NCHAR VARYING do not interoperate with strings declared with CHAR or VARCHAR2. Use TRANSLATE() function to explicitly convert one to the other.

You can use the conversion function ( NCHAR, VARCHAR2  ) to change the type of the two columns to be consistent.

You can use to_char Function to do character conversion between nvarchar2 to varchar2

You can use to_nchar to do character conversion between varchar2 to nvarchar2.

You can use cast Function to do character conversion between varchar2 to nvarchar2

You can use translate…using Function converts varchar2 to nvarchar2

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