具有1个以上商品的订单

Question

这是我的数据库

我需要展示

1）订单中有1件以上的商品

2）每种产品的销售数量清单

ORDERS

Number_ord(PK)  Buyer   Delivery_address    Date

1               Martin  Chicago             2018-12-16
2               John    Berlin              2018-12-17
3               Martin  Chicago             2018-12-18


PRODUCTS

Number_prod Number_ord(FK)  Qty
469841      1               15
469841      2               15
999999      2               6
558585      2               45
469841      3               15
844444      3               80

1）我写了类似的东西，但这是错误的

SELECT orders.Number_ord 
FROM orders 
join products USING(Number_ord) 
GROUP BY COUNT(Number_prod)>1

2）这里，我也有问题

SELECT count(products.Number_prod),sum(products.Qty) 
FROM orders 
join products USING(Number_ord) 
GROUP BY Number_prod

请帮助我

Answer 1

您需要使用HAVING来基于计数进行过滤。

SELECT orders.Number_ord, SUM(products.Qty)
FROM orders
JOIN products USING (Number_ord)
GROUP BY orders.Number_ord
HAVING COUNT(*) > 1