sql server use computed column

Question

I have a query like this:

select 
(price1 + price2 + price3) as total_price 
from prices

How can i use the computed column total_price to c

Answer 1

I'd also consider a computed column on the table if this will used often

ALTER  TABLE prices ADD
   total_price AS (price1 + price2 + price3)

Then your query is

select 
    total_price,
    (price4 + total_price) as total_price2
from prices

This way, you can apply the DRY principle...