Get Unique column value along with other. Columns when using inner join - sql

Question

I have following query and I need unique value for column
Select unique(t.id), log.*
from tableA log
inner join tableT t on t.id1=log.id1
where log.time>=(somedate)
and log.time<(somedate)
and ref-id=20
and ref-id=30
and t.id not in (select unique t.id
from tableA log
inner join tableT t on t.id1=log.id1
where log.time>=(somedate)
and log.time<(somedate)
and ref-id=20
and ref-id=30);
I am not getting unique values for t.id.Can anyone please help ? I am using oracle data base

Answer 1

Remove LOG.* from the SELECT; UNIQUE (as well as DISTINCT) is applied to all columns you select, not only to the one you put into brackets.
[EDIT]
Scott's EMP table contains employees that work in different departments. List of distinct departments is:
SQL> select distinct deptno from emp;
DEPTNO
----------
30
20
10
SQL>
If you include additional columns, such as JOB, the list is changed to
SQL> select distinct deptno, job from emp order by deptno, job;
DEPTNO JOB
---------- ---------
10 CLERK
10 MANAGER
10 PRESIDENT
20 ANALYST
20 CLERK
20 MANAGER
30 CLERK
30 MANAGER
30 SALESMAN
9 rows selected.
SQL>
It is now distinct per DEPTNO and per JOB; you can't get only distinct DEPTNO in such a query.
[EDIT #2: aggregation]
If "distinct" means distinct DEPTNO and the first job for that DEPTNO, then you might need this:
SQL> select deptno, min(job) first_job from emp
2 group by deptno
3 order by deptno;
DEPTNO FIRST_JOB
---------- ---------
10 CLERK
20 ANALYST
30 CLERK
SQL>
[EDIT #3, example based on your query]
Select t.id,
min(log.id) log_id,
min(log.time) log_time,
<the rest of LOG table columns goes here, all of them with MIN>
from tableA log
inner join table ...
<the rest of your query goes here>
group by t.id;

Answer 2

How about something like this?
Select t.id, log.*
from tableA log inner join
(select t.*, row_number() over (partition by id1 order by id) as seqnum
from tableT t
) t
on t.id1 = log.id1
where log.time >= (somedate) and
log.time < (somedate) and
t.seqnum = 1
ref_id = 20 and ref_id = 30 -- this is ALWAYS false, but I'm ignoring that
Notes:
I have no idea what the subquery is supposed to be doing.
The conditions on ref_id will always evaluate to FALSE, so that logic is almost certainly not what you intend.
If ref_id is in the transaction table, then the conditions should be moved to the subquery.