来自多个表的多个连接

Question

我正在使用 SQL Server，但在尝试从 SELECT 查询中获取结果时遇到了困难。

我有 6 张桌子：

• Product
• Market
• Seller
• Buyer
• Customer（关于客户的数据 - 买家和卖家）
• Currency

select * from Product;

id(PK) | name_product
-------+--------------
1      | apple
2      | orange
3      | juice

select * from Market;

OrderID(PK)   |SellOrderID(FK) | BuyOrderID(FK) | product-id
--------------+----------------+----------------+-----------
45            | 5              | 15             | 1
46            | 3              | 36             | 3
58            | 4              | 8              | 2

select * from Seller;

SellOrderID   |id_seller(PK) | id_product 
--------------+--------------+---------------------
5             | 5            | 1
3             | 3            | 3
4             | 2            | 2

select * from Buyer;

BuyOrderID    |id_Buyer(PK)  | id_product 
--------------+--------------+---------------------
15            | 1            | 1
36            | 4            | 3
8             | 6            | 2

select * from Customer;

id_customer(PK) | name_customer
----------------+---------------
1               | Alice
2               | Sam
3               | Katy
4               | Soul
5               | Fab
6               | Yas

select * from Currency;

id_product(PK,FK) | currency(PK)
------------------*-------------
1                 | EUR
2                 | USD
3                 | EUR

我希望选择客户的姓名、他们的订单、买卖的产品名称以及每种产品的货币。

但我没有得到正确的结果。我想要如下所示的结果：

name_customer  | OrderID  | name_product | currency(PK)     
---------------+----------+--------------+-------------
Alice          |  45       | apple        | EUR             
Sam            |  58       | juice        | EUR
Katy           |  46       | orange       | USD
Soul           |  46       | apple        | EUR             
Fab            |  45       | juice        | EUR
Yas            |  58       | orange       | USD

请指教

Answer 1

SELECT c.name_customer
,m.OrderID
,p.name_product
,cc.currency
FROM Customer c
INNER JOIN Buyer b ON b.id_Buyer = c.id_customer
INNER JOIN Market m ON m.BuyOrderID = b.BuyOrderID
INNER JOIN Product p ON p.id = m.product-id
INNER JOIN Currency cc ON cc.id_product = p.id

希望它应该工作！如果没有，请告诉我。