SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g4_write_ad_board WHERE ((INSTR(LOWER(wr_subject), LOWER('O'))>0) and (INSTR(wr_subject, '�뒪占�0占쏙옙占�0占�')>0) and (INSTR(wr_subject, '�궗占�')>0) )
Illegal mix of collations (utf8mb3_general_ci,IMPLICIT) and (euckr_korean_ci,COERCIBLE) for operation 'locate' : 1267