select c.customers_email_address, c.customers_lastname, c.customers_firstname from TABLE_CUSTOMERS c, TABLE_ORDERS o where c.customers_newsletter = '1' AND c.customers_id = o.customers_id and o.date_purchased > subdate(now(),INTERVAL 3 MONTH) GROUP BY c.customers_email_address, c.customers_lastname, c.customers_firstname order by c.customers_lastname, c.customers_firstname ASC