子查询很多，可以怎么优化？

select * from (

select pt_user_id,

       pt_user_name,

       contract_id,

       min(anr) anr,

       pay_style,

       period_num,

       (select qh_res_id from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1) qh_res_id,

       (select delivery_flag from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1) cer_self_take,

       b_typename,

       total_qty,

       make_date,

       valid_date,

       (select contract_intent_status from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1) ht_status,

       (select delivery_e_name from pnf_contract_delivery c where c.type_id = '1' and c.contract_id is not null and c.customer_id=a.customer_id and c.contract_id = a.contract_id and rownum<=1) qr_man,

       a.contract_status co_status,

       customer_id,

       cust_name,

       b_typeid,

       (select sales_contract_id from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1)  sales_contract_id,

       (select sh_name from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1)  sh_name,

       (select end_trans_dw from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1)  end_trans_dw,

      (select end_trans_dw_name from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1)  end_trans_dw_name

     (select end_username from bs.etb_v_order_card_term b where b.sale_contract_id = a.contract_id and b.pt_user_id = a.pt_user_id and rownum<=1)  end_username

 from

     (select distinct * from v_t_s_contract_d where contract_type = '10' and (pay_style = '10' or pay_style = '20') order by make_date desc) a 

group by pt_user_id,pt_user_name,contract_id,pay_style,period_num,b_typename,total_qty,make_date,valid_date,contract_status,customer_id,cust_name,b_typeid)

where 1=1;