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