Question

MEMBER table with primary key MEMBER_ID and MEMBER_PHONE table for MEMBER_ID as foreign key and PHONE_IND as one of column with values ‘S’ (Secondary Phone) or ‘P’ (Primary Phone) along with phone number details. ‘S’ is our key value.

I need oracle query to fetch the Member information with phone if ‘S’ exists, if not ‘P’ phone number.

In MEMBER_PHONE table every member will have two possible rows of ‘S’ and ‘P’, if not atleast ‘P’ as one row.

Thanks in advance for your help.

Answer 1

select m.*
  from MEMBER m
 where exists ( select 1
                  from MEMBER_PHONE mp
                 where mp.member_id = m.member_id
                   and mp.phone_ind = 'S' ); 

EDIT

I think know I understood…

select m.*
     , mp.*
  from member m left outer join
      member_phone mp on m.member_id  = mp.member_id
 where (mp.phone_ind = 'S'
    or ( mp.phone_ind = 'P'
   and not exists( select 1
                     from member_phone mp1
                    where mp1.member_id = mp.member_id
                      and mp1.phone_ind = 'S' )))