SELECT *
FROM (SELECT 'abcd' c1 FROM DUAL
UNION ALL
SELECT 'ab中文d(' c1 FROM DUAL)
WHERE length(c1) <> lengthb(c1);
SELECT *
FROM (SELECT 'abcd' c1 FROM DUAL
UNION ALL
SELECT 'ab中文d(' c1 FROM DUAL)
WHERE length(c1) <> lengthb(c1);