split row_number() over partition over multiple columns

Question

I have a query which uses row_number() over partition. When the result comes out it looks like

Product         Row_Number         Price
A               1                  25
A               2                  20
A               3                  15
B               1                  100
B               2                  10
B               3                  2

I want to get the result to show over columns like

Product      Row1         Row2        Row3      price1       price2       price3
A            1            2           3         25           20           15
B            1            2           3         100          10           2

Should I use something like rank()???

I'm using Teradata

Solution

You can add two more window functions to get the 2nd and 3rd highest price, this should run in the same STAT-step as your current ROW_NUMBER, so there's no additional overhead:

select
   product,
   price as Price1,
   min(price)
   over (partition by product
         order by price desc
         rows between 1 following and 1 following) as Price2,
   min(price)
   over (partition by product
         order by price desc
         rows between 2 following and 2 following) as Price3
from tab
qualify 
   row_number() 
   over (partition by product
         order by price desc) = 1