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操作数据库失败Unknown column 'f.paixu' in 'order clause'
sql:select m.*,f.* from sfo_maintb as m left join sfo_alone as f on m.id=f.id where m.lang='cn' and m.id=f.id and category in (240,241,242,243,244,245) order by f.id desc,f.paixu desc limit 0,20

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