$sql = "select s.*,COALESCE(u.use_num, 0) AS use_num from {$this->tbl} as s left join {$this->formula_use_log_tbl} as u on s.id=u.formula_id and u.uid={$uid} where {$where} group by s.id order by use_num desc,s.sort desc,s.id desc limit {$offset},{$page_size}";
$sql = "select s.*,COALESCE(u.use_num, 0) AS use_num from {$this->tbl} as s left join {$this->formula_use_log_tbl} as u on s.id=u.formula_id and u.uid={$uid} where {$where} group by s.id order by use_num desc,s.sort desc,s.id asc limit {$offset},{$page_size}";