querry 1

select task0_.id as taskId,
       task0_.color as taskColor,
       task0_.created as created,
       task0_.is_done as isDone,
       task0_.task_id as subTask_id,
       task0_.user_id as user_id
from task task0_
where task0_.user_id=1 and (task0_.task_id is null)
group by task0_.id
order by task0_.id asc;

querry 2

select count(task0_.id) as count from task task0_ where task0_.task_id=1