Calculating percentages with GROUP BY query

Question

I have a table with 3 columns which looks like this:

File    User     Rating (1-5)
------------------------------
00001    1        3
00002    1        4
000         


        

Answer 1

Alternatively, you can do the old-school way — arguably easier to grok:

select usr.User                   as User   ,
       usr.Rating                 as Rating ,
       usr.N                      as N      ,
       (100.0 * item.N) / total.N as Pct
from ( select User, Rating , count(*) as N
       from Results
       group by User , Rating
     ) usr
join ( select User , count(*) as N
       from Results
       group by User
     ) total on total.User = usr.User
order by usr.User, usr.Rating

Cheers!