Oracle determines whether the input is Chinese character __oracle

A method that determines whether a field contains Chinese sql> queries all LoginName records that are Chinese characters:

SELECT * from Studentbaseinfo where ASCIISTR (loginname) like '%/% ';

Query all LoginName records that are not Chinese characters:

SELECT * from Studentbaseinfo where ASCIISTR (loginname) isn't like '%/% ';

If the query input data contains Chinese characters, it returns 1, not the return 0;

Select COUNT (1) from dual where ASCIISTR (' Linyb ') like '%/% ';

Select COUNT (1) from dual where asciistr (' kanji ') like '%/% ';

Select COUNT (1) from dual where ASCIISTR (' Inyb ') isn't like '%/% '

In fact, ASCIISTR is only to determine whether it is multibyte, and can not be determined to be a Chinese character, the other multiple-byte representation of the same language.