select frm_key, count(*) as count_replies from t_frm_rep
left join t_frm_top on t_frm_top.ftop_key=t_frm_rep.fk_frm_top
left join t_frm on t_frm.frm_key=t_frm_top.fk_frm
group by frm_key<br><br><b><font color=red>Got error 12 from storage engine