SQL join on second table all distinct rows showing a column from both tables

Question

This might be a very simple sql however for the life of me, I can't seem to get the desired results.

For purposes of illustration, I have two tables, Table A and Table B with the following records in each table.

Thank you in advance and my apologies for the novice formatting on here.

Desired Results

Answer 1

You are looking for full join :

select id, a.col1, b.col2
from a full join
     b
     using (id);

If your database doesn't support full join , I would recommend:

select a.id, a.col1, b.col2
from a left join
     b
     on a.id = b.id
union all
select b.id, null, b.col2
from b
where not exists (select 1 from a where a.id = b.id);