MySql内部连接查询7个表

问题描述：

cars 
------------------------------------ 
¦ car_id ¦ color_id ¦ brand_id ¦ 
------------------------------------ 
¦ 1  ¦ 1   ¦ 3   ¦ 
¦ 2  ¦ 2   ¦ 3   ¦ 
¦ 3  ¦ 1   ¦ 4   ¦ 
¦ 4  ¦ 3   ¦ 4   ¦ 
------------------------------------ 
colors 
----------------------- 
¦ color_id¦ color  ¦ 
----------------------- 
¦ 1  ¦ red  ¦ 
¦ 2  ¦ blue  ¦ 
¦ 3  ¦ green  ¦ 
¦ 4  ¦ white  ¦ 
----------------------- 
brands 
----------------------------------- 
¦ brand_id¦ brand ¦ parent_id ¦ 
----------------------------------- 
¦ 1  ¦ Toyota ¦ 0   ¦ 
¦ 2  ¦ Nissan ¦ 0   ¦ 
¦ 3  ¦ Sunny ¦ 2   ¦ 
¦ 4  ¦ Corrola ¦ 1   ¦ 
----------------------------------- 
companies 
--------------------------------- 
¦ company_id¦ name ¦ location ¦ 
--------------------------------- 
¦ 1   ¦ ABC ¦ New York ¦ 
¦ 2   ¦ XYZ ¦ Florida ¦ 
¦ 3   ¦ ASD ¦ Texas  ¦ 
¦ 4   ¦ 3MM ¦ Florida ¦ 
--------------------------------- 
contacts 
----------------------------------- 
¦ contact_id¦ name ¦ company_id ¦ 
----------------------------------- 
¦ 1   ¦ James ¦ 1   ¦ 
¦ 2   ¦ Kevin ¦ 1   ¦ 
¦ 3   ¦ Mic ¦ 2   ¦ 
¦ 4   ¦ Nadia ¦ 3   ¦ 
----------------------------------- 
orders 
--------------------------------------- 
¦ order_id ¦ company_id ¦ contact_id ¦ 
--------------------------------------- 
¦ 1   ¦ 1   ¦ 1   ¦ 
¦ 2   ¦ 1   ¦ 2   ¦ 
¦ 3   ¦ 2   ¦ 3   ¦ 
¦ 4   ¦ 3   ¦ 4   ¦ 
--------------------------------------- 
order_items 
--------------------------------------- 
¦ sn ¦ order_id ¦ car_id ¦ price ¦ 
--------------------------------------- 
¦ 1 ¦ 1   ¦ 1   ¦ 100 ¦ 
¦ 2 ¦ 2   ¦ 2   ¦ 200 ¦ 
¦ 3 ¦ 3   ¦ 3   ¦ 100 ¦ 
¦ 4 ¦ 3   ¦ 4   ¦ 150 ¦ 
---------------------------------------

我正在一个web应用程序中，我有这7个互相连接的表。我需要一个PHP MYSQL连接查询将列出已经以表格格式已经下令所有汽车行驶下列：

-------------------------------------------------------------------------- 
¦ Order ID ¦ Company Name ¦ Contact Name ¦ Car Ordered   ¦ price ¦ 
-------------------------------------------------------------------------- 
¦ 1  ¦ ABC   ¦ James  ¦ Nissan Sunny, Green ¦ 100 ¦ 
--------------------------------------------------------------------------

请帮助！

你试图达到这样的结果的地方在哪里？ – 2014-09-29 09:15:16

请注意，order_items中的sn列（可能是）多余的 – Strawberry 2014-09-29 09:33:19

我是mysql新手。我可以写简单的querries。我试图用嵌套querry实现这一点，但它并没有工作......这对我来说是一种火箭科学 – user1362473 2014-09-29 09:52:09

答

Please try with this query: 

SELECT orders.order_id as 'Order ID', 
    companies.name as 'Company Name', 
    contacts.name as 'Contact Name ', 
    CONCAT(brands.brand , ', ' ,colors.colcor) as 'Car Ordered', 
    order_items.price as 'price' 
    FROM order_items 
    left outer join orders on orders.order_id = order_items.order_id 
    left outer join contacts on orders.contact_id = contacts.contact_id 
    left outer join companies on orders.company_id = companies.company_id 
    left outer join cars on order_items.car_id =cars.car_id 
    left outer join colors on cars.color_id = colors.color_id 
    left outer join brands on cars.brand_id = brands.brand_id 
    order by brands.brand asc

谢谢。它的工作除了“汽车订购”栏。汽车有序列在所有行中显示“0”零。此列应显示“母品牌，子品牌，颜色”即“Nissa，阳光明媚，绿色” – user1362473 2014-10-01 10:06:50

请再试一次 – jainvikram444 2014-10-01 10:52:29

以前的例子是MS-SQL服务器，现在加入concat函数加入 – jainvikram444 2014-10-01 10:53:26

MySql内部连接查询7个表

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