Query to Identify Sets Having Given Pattern

Question

Hi,
Assume that i have following table
Id Code
1 aaa
1 bbb
1 ccc
2 aaa
2 bbb
2 ddd
3 bbb
3 eee
The records will be grouped by Id. I want to identify sets having following criteria
1. Set should have at least one record with code like 'a%'
and should have at least one record for codes 'bbb', 'ccc' (in this case group 1 would be selected)
2. Set should have at least one record with code like 'a%'
and should have at least one record for either 'bbb' or 'ccc' (in this case group 1and 2 would be selected)
Does anyone have idea about how this could be achieved efficiently? Any pointers, references would be appreciated
Regards
~Pravin.

Answer 1

Problem 1 Can be solved like:
SQL> select * from t;
        ID CODE
         1 aaa
         1 bbb
         1 ccc
         2 aaa
         2 bbb
         2 ddd
         3 bbb
         3 eee
8 rows selected.
SQL> select id
  2  from t
  3  group by id
  4  having sum(case when code like 'a%' then 1 else 0 end) > 0
  5  and sum(decode(code,'bbb',1,0)) > 0
  6  and sum(decode(code,'ccc',1,0)) > 0;
        ID
         1
<br>
<br>
Similarly Problem 2 can also be solved...