数据库错误: [Unknown column 'a.guid' in 'on clause']
select * from `demo_list` A left join `demo_list_content` B on a.guid=b.guid where id=755

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    数据库错误: [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 'ORDER BY id DESC LIMIT 1' at line 1]
    SELECT * FROM demo_list WHERE channelId=542 && id< ORDER BY id DESC LIMIT 1

    数据库错误: [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 'ORDER BY id asc LIMIT 1' at line 1]
    SELECT * FROM demo_list WHERE channelId=542 && id> ORDER BY id asc LIMIT 1

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