Oracle SQL distinct count without outputting columns that make it distinct - sql

Question

I have a table which i want to only output 1 field from so it can be part of another queries WHERE statement (WHERE SID IN (THIS NEW QUERY)).
However because of this i can only include SID in the SELECT, but this is removing that is needed to make the distinct count work.
SO SELECT * FROM Tablea gives me:
SID deta detb
22222 8159 3763
22222 8159 3763
44444 4739 6135
44444 4739 6135
44444 4739 6134
44444 4739 6135
55555 5937 0223
55555 5936 0223
66666 8577 9497
66666 8577 9497
66666 8577 9497
66666 8576 9496
66666 8577 9497
88888 3595 0919
88888 3595 0919
88888 3595 0919
88888 3595 0914
77777 5678 3456
Then SELECT DISTINCT SID, deta, detb FROM Tablea gives me:
SID deta detb
22222 8159 3763
44444 4739 6134
44444 4739 6135
55555 5936 0223
55555 5937 0223
66666 8576 9496
66666 8577 9497
88888 3595 0914
88888 3595 0919
77777 5678 3456
The data i want is this:
SID deta detb
44444 4739 6134
44444 4739 6135
55555 5936 0223
55555 5937 0223
66666 8576 9496
66666 8577 9497
88888 3595 0914
88888 3595 0919
Which can be done by using a count of distinct, however my final output i want is this:
SID
44444
55555
66666
88888
But i cant achieve it when only outputting 1 field.

Answer 1

Use group by:
SELECT SID
FROM Tablea
GROUP BY SID
HAVING COUNT(DISTINCT deta || ':' || detab) > 1;
If you actually wanted the full rows (instead of the SID values), then use window functions:
SELECT a.*
FROM (SELECT a.*, COUNT(DISTINCT deta || ':' || detab) OVER (PARTITION BY SID) as cnt
FROM tablea a
) a
WHERE cnt > 1;

Answer 2

I would do it like this:
with sample_data (SID, deta, detb) as (select 22222, 8159, 3763 from dual union all
select 22222, 8159, 3763 from dual union all
select 44444, 4739, 6135 from dual union all
select 44444, 4739, 6135 from dual union all
select 44444, 4739, 6134 from dual union all
select 44444, 4739, 6135 from dual union all
select 55555, 5937, 0223 from dual union all
select 55555, 5936, 0223 from dual union all
select 66666, 8577, 9497 from dual union all
select 66666, 8577, 9497 from dual union all
select 66666, 8577, 9497 from dual union all
select 66666, 8576, 9496 from dual union all
select 66666, 8577, 9497 from dual union all
select 88888, 3595, 0919 from dual union all
select 88888, 3595, 0919 from dual union all
select 88888, 3595, 0919 from dual union all
select 88888, 3595, 0914 from dual union all
select 77777, 5678, 3456 from dual)
--- end of mimicking your sample data
select sid
from (select distinct sid,
deta,
detb
from sample_data)
group by sid
having count(*) > 1;
SID
----------
44444
66666
55555
88888