postgresql 7.1 select ec_tax(0,:order_shipping_cost,:order_id) select coalesce(base_shipping_cost,0) from ec_admin_settings select coalesce(add_exp_base_shipping_cost,0) from ec_admin_settings select i.item_id, i.product_id, u.offer_code from ec_items i left join (select * from ec_user_session_offer_codes usoc where usoc.user_session_id=:user_session_id) u on (i.product_id=u.product_id) where i.order_id=:order_id