How to use SQL to detect whether a field includes Chinese characters in Oracle

It is implemented with the conversion function of Oracle encoding, which is feasible after testing.

Sql> SELECT *
2 from (SELECT ' ABCD ' C1 from dual
3 UNION ALL
4 SELECT ' AB Test CD ' C1 from dual
5 where C1 <> CONVERT (C1, ' us7ascii ', ' ZHS16GBK ');

C1
--------
AB Test CD

Convert function Description:

CONVERT (Inputstring,dest_charset,source_charset)

InputString: the string to convert

Dest_charset: Target Character Set

Source_charset: Original Character Set

How to use SQL to detect whether a field includes Chinese characters in Oracle