$sql="UPDATE 'student' SET 'course'='javascript','grade'=88,'WHERE 'id'=3";運行後提示;連線成功更新失敗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 ''student' SET 'name'='小明','course'='javascript','grade'=88, 'create_tim' at line 1