Special Join Between 2 tables

Question

Hello,
I have 2 tables t1 and t2
SQL> select p, a, b from t1;
P A B
A 2 3
B 2 3
B 3 1
C 3 1
SQL> select a, b from t2;
A B
2 3
3 1
I want to find all the t1.p columns that t1.a, t1.b columns exist all in t2.
The result of this query in the above example would be "B" because there exists
B 2 3
B 3 1
Thanks,
Andreas KOKKINOS

Answer 1

May be this ?
select t1.p
from t1,
t2
by t1.p
having count(case when t1.a = t2.a and t1.b = t2.b
then 1 end) =
(select count(*) from t2)
Yes, if an exact match is not needed, then this will do:
SQL> create table t1
  2  as
  3  select 'A' p, 2 a, 3 b from dual union all
  4  select 'B', 2, 3 from dual union all
  5  select 'B', 3, 1 from dual union all
  6  select 'C', 3, 1 from dual union all
  7  select 'D', 2, 3 from dual union all
  8  select 'D', 3, 1 from dual union all
  9  select 'D', 8, 9 from dual
10  /
Tabel is aangemaakt.
SQL> create table t2
  2  as
  3  select 2 a, 3 b from dual union all
  4  select 3, 1 from dual
  5  /
Tabel is aangemaakt.
SQL> select t1.p
  2    from t1
  3       , t2
  4   group by t1.p
  5  having count(case when t1.a = t2.a and t1.b = t2.b then 1 end) = (select count(*) from t2)
  6  /
P
B
D
2 rijen zijn geselecteerd.Regards,
Rob.