Php mySQL：如何加入只返回最新日志的用户日志？

嗨，伙计们，我有两张表，用户/日志之类的东西

tk_是用户的资产

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tk_会话日志除非您需要其他信息，否则MAX应该帮助您

SELECT u.*, MAX(l.stamp_out) FROM user u
INNER JOIN logs l ON l.user_id = u.id
WHERE l.stamp_out = 0
GROUP BY u.id

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如果您还需要更多，请看看这个问题：

您的命名约定有点粗糙

SELECT assets.`ass_id`, sessions.`stamp_in`, sessions.`stamp_out`, sessions.`ass_id`
FROM tk_assets assets
LEFT JOIN tk_sessions sessions
ON assets.`ass_id` = sessions.`ass_id`
WHERE assets.`ass_id` = sessions.`ass_id`
GROUP BY sessions.`ass_id`
ORDER BY sessions.`stamp_in` DESC

SELECT assets.`ass_id`, sessions.`stamp_in`, sessions.`stamp_out`, sessions.`ass_id`
FROM tk_assets assets
LEFT JOIN tk_sessions sessions
ON assets.`ass_id` = sessions.`ass_id`
WHERE assets.`ass_id` = sessions.`ass_id`
GROUP BY sessions.`ass_id`
ORDER BY sessions.`stamp_in` DESC