Retrieve only one type of phone number

Question

Hi
In the following sample query I need to retrieve only one phone number. The preference is if Mobile available - mobile number if not Home number (Type - H1), else Work number (W1).
I have included the script and sample output what I am getting from the SQL
Thanks in advance
Regards
Sriram
select pp.ph_id
,papf.person_id
,pp.ph_type
,pp.ph_no
,pp.date_from
,pp.date_to
from per_phones                      pp
,per_all_people_f                    papf
,per_contact_relationships           pcr
where papf.person_id = pp.parent_id
and pcr.person_id = papf.person_id
and trunc(sysdate) between trunc(nvl(pcr.date_start, sysdate-1))
and trunc(nvl(pcr.date_end, sysdate+1))
and papf.person_id in (146564, 514)
and pcr.primary_contact_flag  = 'Y'
and trunc(sysdate) between papf.effective_start_date and papf.effective_end_date
and trunc(sysdate) between nvl(pp.date_from, sysdate-1) and nvl(pp.date_to, sysdate+1);output
PH_ID     PERSON_ID     PH_TYPE     PH_NO     DATE_FROM     DATE_TO
3261     514          H1          987524879     13-Jun-04     
117287     514          M          0403672797     11-May-05     
141997     146564          H1          54789620     15-Feb-06     05-Mar-10
311028     146564          H2          235469          5-Dec-09     
311029     146564          W1          8300054          15-Dec-09     
311108     146564          M          04126872     12-Feb-10

Answer 1

Not tested, but something like this might do the trick. What you need to do is assign a hierarchy to the phone type codes, then choose the top one for each parent id.
WITH phone_list
  AS ( SELECT parent_id,
              MIN( CASE ph_type
                     WHEN 'M'  THEN 1
                     WHEN 'H1' THEN 2
                     WHEN 'W'  THEN 3
                     ELSE 99
                   END )  AS phone_pref
         FROM per_phones
        GROUP
           BY parent_id )
SELECT pp.ph_id,
       papf.person_id,
       pp.ph_type,
       pp.ph_no,
       pp.date_from,
       pp.date_to
  FROM per_phones                pp,
       per_all_people_f          papf,
       per_contact_relationships pcr,
       phone_list                lst
  WHERE papf.person_id = pp.parent_id
    AND pcr.person_id = papf.person_id
    AND trunc(sysdate) between trunc(nvl(pcr.date_start, sysdate-1))
    AND trunc(nvl(pcr.date_end, sysdate+1))
    AND papf.person_id in (146564, 514)
    AND CASE pp.ph_type
                     WHEN 'M'  THEN 1
                     WHEN 'H1' THEN 2
                     WHEN 'W'  THEN 3
                     ELSE 99
                   END = lst.phone_pref
   AND pp.parent_id = lst.parent_id;