T-SQL Value from 1st select on each row in 2nd select of a union all

Question

Very simplified, my sql looks like this:

;with RawData as (
select from table1

union all

select from table2)

select * from rawdata

In the first select I get the On Hand quantity. In the 2nd select that column is zero because I'm getting what's on order. I want the On Hand quantity to repeat on each row. So instead of

8
0
0
0

I would have

8
8
8
8

How do I do that? Thanks!

Answer 1

You can try sum() over() as below:

;with RawData as (
...
)
select sum(yourcolumn) over() from RawData

If you have specific id column then you can use

select sum(yourcolumn) over(partition by id) from RawData