I seek a way to be able to write something like this 

```
select complicated_calculation1 as comp1, 
complicated_calculation2 as comp2, 
(comp1/comp2) as percent
from table

```

rather than writing it in the far more complicated way like this

```
select complicated_calculation1 as comp1, 
complicated_calculation2 as comp2, 
(complicated_calculation1/complicated_calculation2) as percent
from table

```

Is this possible?