select g.id, name, weight, sum(count) as total from goods g left join trans t on g.id = t.goods_id group by g.id having sum(count) > 20 and weight <50
select g.id, name, weight, sum(count) as total from goods g left join trans t on g.id = t.goods_id group by g.id having sum(count) > 20 and weight <50