如何比较sql中具有不同列数的两个表

Question

There are 2 tables - table1 with columns source ( varchar ) and table2 with columns new_source ( varchar ) and id ( number ).

I want to compare table1 with table2. Output should have the new_source and id which are not present in table2 but present in table1.

Here's an example:

Table1

Table2

Output:

I have tried using not exists and minus but I get only new_source but not id in the output.

Kindly help me in writing the query.

Answer 1

select *
from table2
where new_source in
  (select source from table1
   minus
   select new_source from table2);

Answer 2

Hmmm . . . it is not clear where the id comes from. So, I'm thinking:

select listagg(source, ',') within group (order by source), 10 as id
from table1 t1
where not exists (select 1
                  from table2 t2
                  where t2.source = t1.source and t2.source = 10
                 );