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数据查询出错，错误信息已记录，
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select * from demo_product where isvalid=1 and find_in_set(,pid) order by orders desc, id desc limit 6

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 'pid) order by orders desc, id desc limit 6' at line 1 (1064)