SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g4_write_column WHERE ((INSTR(LOWER(wr_subject), LOWER('ssd'))>0) and (INSTR(wr_subject, '占�0占쎌껜占�0占�0占쏙옙')>0) and (INSTR(wr_subject, '占�0占쎌옣占�')>0) )
Illegal mix of collations (utf8mb3_general_ci,IMPLICIT) and (euckr_korean_ci,COERCIBLE) for operation 'locate' : 1267