select * from xe_comments where content like '%dskfjlskjdflsk%';

select * from xe_comments where content like '%ㄳㄳ%';

select * 대신에 delete 하시면 삭제됩니다.

delete from xe_comments where content like '%ㄳㄳ%';

delete FROM xe_comments_list WHERE document_srl like '1763183';