thing.php

$sql = "SELECT c.name, c.cust_num, SUM(qty) bottles, 
  GROUP_CONCAT(h.order_num) orders
  FROM orders o INNER JOIN hist h ON h.order_num = o.order_num
  INNER JOIN users c ON c.cust_num = o.cust_num
  WHERE o.order_num IN ! GROUP BY o.cust_num";