使用 where 和 Where IN 连接多个表

Question

挑战

我正在尝试将用户表加入他们关注的品牌列表（通过关注者）并获取整个产品列表。我还想右加入产品可用的 Orders 表，并且 Stage 字段（在 Orders 中）设置为“basket”。

表格

用户：ID、姓名

+-------+-------------+
| ID    | Name        |
+-------+-------------+
| 1     |   User 1    |
| 2     |   User 2    |
+-------+-------------+

品牌：ID、名称

+-------+-------------+
| ID    | Name        |
+-------+-------------+
| 1     |   brand 1   |
| 2     |   brand 2   |
+-------+-------------+

产品：ID、名称、品牌 ID、价格

+-------+-----------+-------------+-------------+
| ID    | Name      | Brand       | Price       |
+-------+-----------+-------------+-------------+
| 1     | product 1 | 1           | 5           |
| 2     | product 2 | 1           | 6           |
| 3     | product 3 | 2           | 7           |
+-------+-----------+-------------+-------------+

订单：ID、用户 ID、产品 ID、阶段（篮子）

+-------+-----------+-------------+-------------+
| ID    | User      | Product     | Stage       |
+-------+-----------+-------------+-------------+
| 1     | 1         | 1           | basket      |
| 2     | 1         | 2           | basket      |
| 3     | 1         | 1           | completed   |
+-------+-----------+-------------+-------------+

关注者：用户、品牌 ID

+-------+-----------+-------------+
| ID    | User      | Brand       |
+-------+-----------+-------------+
| 1     | 1         |   1         |
+-------+-----------+-------------+

Answer 1

select Orders.ID
from Orders
inner join User on  Followers.User = User.ID
inner join Brand on Followers.Brand =  Brand.ID
inner join Product on Product.Brand = Brand.ID
right join order on (Orders.Product = Product.ID and Orders.User = User.ID)
where Orders.Stage IN ("basket")