Question

我有三张桌子：一：table order_info

ordre_id     int
add_time     int

二：table order_goods

id           int
goods_id     int
order_id     int
sale_number  int

三：表商品

goods_id     int 
goods_name   varchar

现在我想通过这个号码查询商品销售总数和订单，当商品没有销售号码时，显示为零。我使用子查询，但它太慢了，sql就像：

SELECT t.* 
FROM goods AS tg 
LEFT JOIN (
    SELECT SUM(og.goods_number) AS total_num, g.goods_id, g.goods_name 
    FROM order_info oi 
    LEFT JOIN order_goods AS og     ON oi.order_id=og.order_id 
    LEFT JOIN goods AS g            ON g.goods_id=og.goods_id 
    WHERE oi.add_time>1415635200 
) AS t          ON t.goods_id=tg.goods_id 
ORDER BY t.total_num DESC;

你能有一些商品吗？谢谢！

Answer 1

为什么不删除外部查询部分并运行

select 
    SUM(og.goods_number) AS total_num, 
    g.goods_id, 
    g.goods_name 
from 
    order_info oi 
left join order_goods AS og on oi.order_id=og.order_id 
left join goods AS g on g.goods_id=og.goods_id 
right join goods as g2 on g2.goods_id=og.goods_id 
where  oi.add_time > 1415635200

？您在桌子上设置了哪些指数？

Answer 2

您不需要外部查询您可以改用GROUP BY。

select SUM(og.goods_number) AS total_num, 
       g.goods_id, 
       g.goods_name
from order_info oi 
left join order_goods AS og 
on oi.order_id=og.order_id 
left join goods AS g 
on g.goods_id=og.goods_id 
where  oi.add_time>1415635200 
group by g.goods_id, g.goods_name
order by total_num desc

Answer 3

如果我读了你的问题，你需要全部销售所有商品。试试这个：

Select  g.goods_id, g.goods_name, IsNull(SUM(og.goods_number), 0) as total_num
From goods g
Left Join order_goods og
    On og.goods_id = g.goods_id
Left Join order_info oi
    On oi.order_id = og.order_id
WHERE oi.add_time>1415635200
Group By g.goods_id, g.goods_name
Order By total_num desc

我实际上只是对你的查询感到困惑。＆＃34; goods_number＆＃34;专栏来自哪里？是什么意思＆＃34; sale_number＆＃34;专栏？

Mysql子查询太慢，查询销售数量

3 个答案: