letsql='SELECT DISTINCT SUM(s.amount) as total,cu.name FROM sales s,customers cu,contacts co WHERE co.iduser = ? AND co.idcustomer = cu.idcustomer AND cu.idcustomer = s.idcustomer AND s.month >= ? AND s.year >= ? GROUP BY cu.name ORDER BY total DESC';
letsql='SELECT DISTINCT SUM(s.amount) as total,cu.name FROM sales s,customers cu,contacts co WHERE co.iduser = ? AND co.idcustomer = cu.idcustomer AND cu.idcustomer = s.idcustomer AND ((s.month >= ? AND s.year = ?) OR s.year > ?) GROUP BY cu.name ORDER BY total DESC';