MySQL - 需要帮助来找出多个连接

Question

我正在使用以下查询从用户的表中获取事务.然后我想检索sender_id和recipient_id的用户名.但是我似乎只能为recipient_id或sender_id获取它.任何人都有任何想法,我怎么能得到两者.

SELECT us.name, ta.amount, ta.recipient_id, ta.sender_id, ta.timestamp_insert
        FROM  `transactions` AS ta
        JOIN users AS us
        ON ta.recipient_id=us.u_id
        WHERE ta.sender_id =111111 OR ta.recipient_id = 111111
        LIMIT 0 , 10

事务表列:

transaction_id
tw_id
tw
sender_id
recipient_id
amount
timestamp_insert
timestamp_start timestamp_complete transaction_status

用户表列:

u_id,名字

Answer 1

您需要加入两次,因此:

SELECT ta.amount, ta.recipient_id, ta.sender_id, ta.timestamp_insert, sender.name as Sender, recipient.name as Recipient
        FROM  `transactions` AS ta
        JOIN users AS recipient
        ON ta.recipient_id=recipient.u_id
        JOIN users AS sender
        ON ta.sender_id=sender.u_id
        WHERE ta.sender_id =111111 OR ta.recipient_id = 111111
        LIMIT 0 , 10