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create table statuses (id int primary key, title text);
insert into statuses values (1, 'Completed'), (2, 'Not Completed');
create table problems (id int primary key, title text);
insert into problems values (1, 'Problem 1'), (2, 'Problem2'), (3, 'Problem3');
create table tasks (id int, problem_id int references problems, status_id int references statuses);
insert into tasks values (1, 1, 1), (2, 1, 2);
select
problems.*,
case when coalesce(max(status_id), 2) = 2 then 'Not Completed' else 'Completed' end problem_status
from problems
left join tasks on tasks.problem_id = problems.id
group by problems.id, problems.title
order by problems.id;
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