select o.date_purchased, c.customers_email_address, c.customers_lastname, c.customers_firstname from TABLE_CUSTOMERS c, TABLE_ORDERS o WHERE c.customers_id = o.customers_id AND c.customers_newsletter = 1 GROUP BY c.customers_email_address HAVING max(o.date_purchased) <= subdate(now(),INTERVAL 3 MONTH) ORDER BY c.customers_lastname, c.customers_firstname ASC