SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g4_write_lec WHERE ((INSTR(wr_subject, '�ٽɱ��')>0) )

Illegal mix of collations (utf8mb3_general_ci,IMPLICIT) and (euckr_korean_ci,COERCIBLE) for operation 'locate' : 1267

error file : /bbs/board.php