INSERT INTO query_cache(session_id, url_id, weight)    SELECT DISTINCT '0m51us95qt699hlg728p2g5b80',u.id,1 as weight
                                  FROM lect_url AS u
                                  WHERE (LOCATE('��', u.author )>0)
                                    AND u.is_visible=1   UNION SELECT DISTINCT '0m51us95qt699hlg728p2g5b80',u.id,2 as weight
                                  FROM lect_url AS u
                                  WHERE (LOCATE('��', u.author )>0)
                                    AND u.is_visible=1  
Illegal mix of collations (utf8mb4_general_ci,IMPLICIT) and (utf8mb3_general_ci,COERCIBLE) for operation 'locate'