Re-writting query

Question

Hi,
I have one report which i running slow. I know the problem this is due to a query which is called every time for each record. So, i need help to rewrite it.
1. This is the first query
SELECT id,
       t_id,
       p_id,
       a_date,
       d_date,
       u_dt,
       f_id,
  FROM xyz
WHERE t_ind = 'N'
   AND s_cd IN (3, 5)
   AND p_id = '100177'
   AND d_date BETWEEN to_date('10/01/2008', 'MM/DD/YYYY') AND to_date('12/31/2008', 'MM/DD/YYYY')
   AND t_id IN (1,4)
Now, for every id it calls same table in another function to get s_id. (2)
2.
SELECT s_id
  FROM (SELECT lead(m.s_id, 0) over(PARTITION BY m.p_id, m.t_id, m.a_date, m.d_date ORDER BY m.u_dt DESC, m.f_id DESC) s_id,
         row_number() over(PARTITION BY m.p_id, m.t_id, m.a_date, m.d_date ORDER BY m.u_dt DESC, m.f_id DESC) row_num
          FROM xyz
         WHERE m.p_id = '100177'
           AND m.t_id = 4
           AND m.px_id = '001'
           AND m.a_date = to_date('01/25/2009', 'MM/DD/YYYY')
           AND m.d_date = to_date('02/07/2009', 'MM/DD/YYYY')
           AND m.s_id IS NOT NULL)
WHERE row_num = 1;
3. So, for every call for 1st query it calls second one and this is where problem lies. How can we combine this both into one so that we have only one call to this table to avoide multiple calls.
so that we can include s_id into same query.

Answer 1

maybe this?
select xyz3,id,
       xyz3.t_id,
       xyz3.p_id,
       xyz3.a_date,
       xyz3.d_date,
       xyz3.u_dt,
       xyz3.f_id,
       xyz3.s_id
  from (SELECT xyz1.id,
               xyz1.t_id,
               xyz1.p_id,
               xyz1.a_date,
               xyz1.d_date,
               xyz1.u_dt,
               xyz1.f_id,
               lead(xyz2.s_id, 0) over(PARTITION BY xyz2.p_id, xyz2.t_id, xyz2.a_date, xyz2.d_date
                                       ORDER BY xyz2.u_dt DESC, xyz2.f_id DESC) s_id,
               row_number() over(PARTITION BY xyz2.p_id, xyz2.t_id, xyz2.a_date, xyz2.d_date
                                 ORDER BY xyz2.u_dt DESC, xyz2.f_id DESC) row_num
          FROM xyz xyz1,
               xyz xyz2
         WHERE ((xyz1.t_ind = 'N') AND
                (xyz1.s_cd IN (3, 5)) AND
                (xyz1.p_id = '100177') AND
                (xyz1.d_date BETWEEN to_date('10/01/2008', 'MM/DD/YYYY') AND to_date('12/31/2008', 'MM/DD/YYYY')) AND
                (xyz1.t_id IN (1,4)))
           AND ((xyz2.p_id = xyz1.p_id) AND
                (xyz2.t_id = xyz1.t_id) AND
                (xyz2.px_id = xyz1.px_id) AND
                (xyz2.a_date = xyz1.a_date) AND
                (xyz2.d_date = xyz1.d_date) AND
                (xyz2.s_id IS NOT NULL))) xyz3
where xyz3.row_num = 1note: untested