mysql - mysql查询以显示发送者和接收者的消息

Question

我的消息传递架构是这样的

USER  
id  
name 

MESSAGE  
id  
messagetitle    
sender_id    
receiver_id  

我想显示messagetitle发件人和收件人姓名

例如 MySQL 查询应该显示：

+--------------+------------+--------------+
| MessageTitle | SenderName | Recievername |
+--------------+------------+--------------+
| Important    | Raj        | Vijay        |
| Solution     | Vijay      | Raj          |
+--------------+------------+--------------+

Answer 1

为您的解决方案尝试以下 sql：

SELECT 
    m.messagetitle AS MessageTitle
    ,u1.Name AS SenderName
    ,u2.Name AS Recievername 
FROM MESSAGE m 
INNER JOIN USER u1 ON u1.id = m.sender_id 
INNER JOIN USER u2 ON u2.id = m.receiver_id

SQL 小提琴演示

Answer 2

应该是一个普通的老式简单连接，写意之类的；

SELECT m.messagetitle, s.name sender, r.name receiver
FROM message m
JOIN user s ON m.sender_id=s.id
JOIN user r ON m.receiver_id=r.id