Oracle: Get a query to always return exactly one row, even when there's no data to be found

Question

I have a query like this:

   select data_name
   into v_name
   from data_table
   where data_table.type = v_t_id

Normally, this query shou

Answer 1

https://stackoverflow.com/a/4683045/471149 answer is nice, but there is shorter solution

select * from my_table ce, (select 150 as id from dual) d
where d.id = ce.entry_id (+)