Oracle: Using Pseudo column value in the same Select statement

Question

I have a scenario in oracle where i need to be able to reuse the value of a pseudo column which was calculated previously within the same select statement something like:

Answer 1

very similar to the previous poster, but I prefer the method I show below, it is more readable, thusly more supportable, in my opinion

select val1 || val2 || val3 as val4, val1 from (
   select 'output1' as val1, '-output2' as val2, '-output3' as val3 from dual
)