Query Regarding fetching selected records from table

Question

Hi All,
I have a table like below:
NUM1     NUM2     TYPE
1     2     A
1     2     S
2     3     S
3     4     A
3     4     S
4     5     S
If for a record TYPE='A' then do not select the records for those num1 and num2.
Eg: for num1=1 and num2=2 there are two records with type='A' and 'S', only records with type 'A' should get selected.
Output should be like this:
NUM1     NUM2     TYPE
1     2     A
2     3     S
3     4     A
4     5     S
Please anyone could help me in this query.
Any help would be highly appreciated.
Thanks & Regards
Anuj

Answer 1

Just MIN function will get what you want
SQL> with t
  2  as
  3  (
  4     select 1 num1, 2 num2, 'A' type from dual union all
  5     select 1, 2, 'S' from dual union all
  6     select 2, 3, 'S' from dual union all
  7     select 3, 4, 'A' from dual union all
  8     select 3, 4, 'S' from dual union all
  9     select 4, 5, 'S' from dual
10  )
11  select num1, num2, min(type) type
12    from t
13  group by num1,num2
14  order by num1,num2
15  /
      NUM1       NUM2 T
         1          2 A
         2          3 S
         3          4 A
         4          5 S