mysql表有两个来自另一个同一表的外键

发票
用户

在user表中我有

user_id 
user_name 
user_email  
user_address

在发票表我有

invoice_id 
invoice_to_user_id 
invoice_by_user_id 
invoice_date

在发票表中，我有两个来自用户表的外键。
1. invoice_to_user_id
2. invoice_by_user_id

现在我想做出让外国keys.eg的用户信息单号查询，
1 invoice_to_user_name
2. invoice_to_user_email
3. invoice_to_user_address
4. invoice_by_user_name
5. invoice_by_user_email
6. invoice_by_user_address

提前致谢。

来源

2014-03-04 Shahabi

你想要什么作为输出？ – SagarPPanchal

加入'user'表格2次 –

可以显示你已经完成了什么和你的结果 –

加入与用户表中的发票表格两次，一次在invoice_to_user_id，然后再打开invoice_by_user_id，例如

SELECT 
INV.invoice_id, 
US1.user_name AS invoice_to_user_name, 
US1.user_email AS invoice_to_user_email, 
US1.user_address AS invoice_to_user_address, 
US2.user_name AS invoice_by_user_name, 
US2.user_email AS invoice_by_user_email, 
US2.user_address AS invoice_by_user_address 
FROM 
[invoice] INV 
INNER JOIN [user] US1 ON INV.invoice_to_user_id = US1.user_id 
INNER JOIN [user] US2 ON INV.invoice_by_user_id = US2.user_id

来源

2014-03-04 11:01:07

感谢Adam it works – Shahabi

SELECT t.user_name AS invoice_to_user_name, 
     t.user_email AS invoice_to_user_email, 
     t.user_address AS invoice_to_user_address, 
     b.user_name AS invoice_by_user_name, 
     b.user_email AS invoice_by_user_email, 
     b.user_address AS invoice_by_user_address 
FROM invoice i 
LEFT JOIN user t ON t.user_id = i.invoice_to_user_id 
LEFT JOIN user b ON b.user_id = i.invoice_by_user_id

来源

2014-03-04 10:53:24

mysql表有两个来自另一个同一表的外键

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