저에게는 유용히 쓰일만한넘들 감사합니다. ^^
SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g4_write_unbox WHERE ((INSTR(wr_subject, '占�0占쎈┛占�0占쏙옙占�0占쏙옙遊됲솴占�0占�0占쎌옣占�0占쏙옙占�')>0) )
Illegal mix of collations (utf8mb3_general_ci,IMPLICIT) and (euckr_korean_ci,COERCIBLE) for operation 'locate' : 1267