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如何解决SQL_ERROR_INFO: “You have an error in your SQL syntax; check the manual that corresponds to your_you have an error in your sql syntax;

you have an error in your sql syntax;

如何解决SQL_ERROR_INFO: “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 ‘.difficult_level\n (count(q1.question_id)/count(distinct q1.device_id)) as avg’ at line 3”

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