HELP , SQL-AND

Question

Hi everyone:
Here i have a table:
create table cap_binding (
test_ser_id NUMBER(10) not null,
test_cap_id NUMBER(10) not null,
cap_binding_id NUMBER(10) not null,
constraint PK_CAP_BINDING primary key (cap_binding_id)
insert into cap_binding values(64,21,1);
insert into cap_binding values(64,1,2);
insert into cap_binding values(65,1,3);
now, i want to find out the test_ser_id where the corresponding test_cap_id is 21 AND 1 , and in the given
data, the result should be the first two records.
initially, i write: select y.TEST_SER_ID from cap_binding y where y.test_cap_id in (1,21), but the in operator performs OR logic and i get three records.
I cannot figure out how to write the sql. Could anyone help me?
Thanks.

Answer 1

This will work if you have a unique constraint on test_ser_id, test_cap_id:
with t as (
select 1 col1 from dual UNION ALL
select 21 col1 from dual
select * from (
select test_ser_id,
       test_cap_id,
       cap_binding_id,
       COUNT(*) OVER (PARTITION BY test_ser_id) cnt
from cap_binding)
where cnt = (SELECT DISTINCT COUNT(*) FROM t);
TEST_SER_ID            TEST_CAP_ID            CAP_BINDING_ID         CNT                   
64                     21                     1                      2                     
64                     1                      2                      2                     
2 rows selectedI used a table using a with clause to store the values we are looking for (1, 21), but you could use a pipelined function or a variable as well.