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我正在尝试创建一个安全的会话管理，其中每个用户都会获得一个哈希，如果用户在其他地方登录，那么它会检查用户是否拥有最近登录的哈希。这样，如果用户忘记登出，系统会替他们登出帐户。这是我写的 sql 语句，它给了我这个错误。有人能告诉我为什么吗？

谢谢

"SELECT * FROM 'v_pos_user_session WHERE userID='$userID' AND hash='$hash' AND admin='0' time=(SELECT max(time) FROM v_pos_user_session WHERE userID='$userID' AND admin='0')"

QLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'time=(SELECT max(time) FROM v_pos_user_session WHERE userID='6' AND admin='0')' at line 1
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1 回答 1

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你必须time用反引号逃脱而你忘记了and

SELECT * FROM v_pos_user_session 
WHERE userID='$userID' 
AND hash='$hash' 
AND admin='0' 
and `time`=(SELECT max(time) FROM v_pos_user_session 
            WHERE userID='$userID' AND admin='0')

'而你之前留下了一个不必要的东西v_pos_user_session

于 2012-06-04T15:03:17.067 回答