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我有两个人之间的消息对话，用户 222 和用户 5555，显示如下：

Conversation-ID 1, Message-ID 5, User-ID 222: "Oh, and I'm happy about that!"
Conversation-ID 1, Message-ID 4, User-ID 222: "And bought me a new car."
Conversation-ID 1, Message-ID 3, User-ID 222: "I just won some money!"
Conversation-ID 1, Message-ID 2, User-ID 5555: "Fine, how are you?"
Conversation-ID 1, Message-ID 1, User-ID 222: "Hi there, how are you?"

现在我正在寻找 PHP / MySQL 中的解决方案，以仅显示来自 User-ID 222 的消息，直到来自 User-ID 5555 的消息。

结果应该是：

Conversation-ID 1, Message-ID 5, User-ID 222: "Oh, and I'm happy about that!"
Conversation-ID 1, Message-ID 4, User-ID 222: "And bought me a new car."
Conversation-ID 1, Message-ID 3, User-ID 222: "I just won some money!"

其实我有

"SELECT * FROM table_conversations WHERE conversation_id='1' and user_id !='5555' ORDER BY message_id DESC"

但当然这会显示来自用户 ID 222 的所有消息。我想要的只是来自用户 ID 222 的最后未答复的消息。

PHP 和 MySQL 中是否有任何命令或解决方案来获得此结果，也适用于所有其他对话？

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1 回答 1

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假设消息 id 指定消息的顺序：

select *
from table_conversation c
where user_id = 222 and
      message_id > (select max(message_id) from table_conversation c2 where user_d = 555);
于 2013-09-05T13:14:11.437 回答