Help needed in inserting data using a query

Question

I need to have some data as a result of the following query:
select sched_num,load_id,ord_id,split_id from ord_load_seq
where (ord_id,split_id,sched_num) in (select ord_id,split_id,sched_num from ord_load_seq where seq_num = '2'
group by ord_id,split_id,sched_num having count(1) >1)
order by ord_id,split_id,sched_num;
But currently it retunrns no rows. The problem is in the having count(1)> 1 clause.
When i make =1, it returns rows. But no rows on > 1. I even tried inserting some rows to get the result >1
But still the query on a whole returns no rows.Please help.

Answer 1

ohhh... lets start our lesson children:
here is code to consider:
Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.2.0
SQL>
SQL> --Q1
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 3 fld3 from dual
  7  union all
  8  select 1 fld1, 2 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 3 fld2, 3 fld3 from dual)
11  select  fld1, fld2, fld3 from tbl
12  order by fld1, fld2, fld3
13  /
      FLD1       FLD2       FLD3
         1          1          1
         1          1          2
         1          1          3
         1          2          3
         1          3          3
SQL> --Q2
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 3 fld3 from dual
  7  union all
  8  select 1 fld1, 2 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 3 fld2, 3 fld3 from dual)
11  select  fld1, fld2, fld3, count(1) from tbl
12  group by fld1,fld2,fld3
13  order by fld1, fld2, fld3
14  /
      FLD1       FLD2       FLD3   COUNT(1)
         1          1          1          1
         1          1          2          1
         1          1          3          1
         1          2          3          1
         1          3          3          1
SQL> --Q3
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 3 fld3 from dual
  7  union all
  8  select 1 fld1, 2 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 3 fld2, 3 fld3 from dual)
11  select  fld1, fld2, fld3 from tbl
12  group by fld1,fld2,fld3
13  having count(1) > 1
14  order by fld1, fld2, fld3
15  /
      FLD1       FLD2       FLD3
SQL> --Q4
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 2 fld3 from dual
  7  union all
  8  select 1 fld1, 1 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 2 fld2, 3 fld3 from dual
11  union all
12  select 1 fld1, 3 fld2, 3 fld3 from dual)
13  select  fld1, fld2, fld3 from tbl
14  order by fld1, fld2, fld3
15  /
      FLD1       FLD2       FLD3
         1          1          1
         1          1          2
         1          1          2
         1          1          3
         1          2          3
         1          3          3
6 rows selected
SQL> --Q5
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 2 fld3 from dual -- inserted duplicate row
  7  union all
  8  select 1 fld1, 1 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 2 fld2, 3 fld3 from dual
11  union all
12  select 1 fld1, 3 fld2, 3 fld3 from dual)
13  select  fld1, fld2, fld3, count(1)   from tbl
14  group by fld1,fld2,fld3
15  order by fld1, fld2, fld3
16  /
      FLD1       FLD2       FLD3   COUNT(1)
         1          1          1          1
         1          1          2          2
         1          1          3          1
         1          2          3          1
         1          3          3          1
SQL> --Q6
SQL> with tbl as
  2  (select 1 fld1, 1 fld2, 1 fld3 from dual
  3  union all
  4  select 1 fld1, 1 fld2, 2 fld3 from dual
  5  union all
  6  select 1 fld1, 1 fld2, 2 fld3 from dual -- inserted duplicate row
  7  union all
  8  select 1 fld1, 1 fld2, 3 fld3 from dual
  9  union all
10  select 1 fld1, 2 fld2, 3 fld3 from dual
11  union all
12  select 1 fld1, 3 fld2, 3 fld3 from dual)
13  select  fld1, fld2, fld3 from tbl
14  group by fld1,fld2,fld3
15  having count(1) > 1
16  order by fld1, fld2, fld3
17  /
      FLD1       FLD2       FLD3
         1          1          2
SQL> Q1. As you may see we have an bunch of data where each row is unique combination of the columns value.
Q2. lets try to group it by fld1 and fld2 and fld3 columns. We don't expect any miracle and got the same data as Q1. Why? Because each row is unique combination(group) in scope of fld1, fld2, fld3 - count(1) exactly shows us that.
Q3. Q2 is explanation why we got no rows filter (having count(1) > 1)because the result of the clause is always false.
Q4. Lets put some duplication.
Q5. Now we got some new result. Count shows us group with more then one rows.
Q6. Shows us exact group which we've found in Q5.