Invalide identifier error, when use subselect

Question

Hi all,
I got "ORA-0094: sp.spriden_pidm invalid identifier "error when runing the following query.
select (select t.name from
(select rownum row_number, s.spriden_last_name name
from spriden s
where s.spriden_pidm = sp.spriden_pidm) t
where t.row_number = 1) last_name
from spriden sp
where sp.spriden_pidm = 70105;
Any one has an idea why this is happening?
Thanks

Answer 1

Unless I am missing something here, this looks like a straight pivot query to me.
SQL> with my_test AS (SELECT 1 id, 'June' contact_name FROM dual UNION ALL
  2                   SELECT 1, 'Email' FROM dual UNION ALL
  3                   SELECT 1, 'Mark' FROM dual UNION ALL
  4                   SELECT 2, 'Tom' FROM dual),
  5       my_test_2 AS (SELECT 1 id, trunc(sysdate) act_date FROM dual UNION ALL
  6                     SELECT 1, trunc(sysdate-1) FROM dual UNION ALL
  7                     SELECT 2, trunc(sysdate-1) FROM dual)
  8  SELECT id, act_date,
  9         MAX(DECODE(rn, 1, contact_name)) nc1,
10         MAX(DECODE(rn, 2, contact_name)) nc2,
11         MAX(DECODE(rn, 3, contact_name)) nc3
12  FROM (SELECT m.id, contact_name, act_date,
13               ROW_NUMBER() OVER (PARTITION BY m.id
14                                  ORDER BY contact_name) rn
15        FROM my_test m, my_test_2 m2
16        WHERE m.id = m2.id and
17              m2.act_date = trunc(sysdate-1))
18  GROUP BY id, act_date;
        ID ACT_DATE    NC1   NC2   NC3
         1 11-Sep-2008 Email June  Mark
         2 11-Sep-2008 TomAssuming that you have a known maximum number of possible values in my_test for a given id this should work. You may need to use something other than the contact_name in the order by in the row_number function if you require the values in specific columns, but given your sample data, I have no idea what that might be.
John