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

In TSQL this should work

SELECT
    User,
    Rating,
    Count(*), SUM(COUNT(*)) OVER (PARTITION BY User, Rating ORDER BY User, Rating) AS Total,
Count(*)/(SUM(COUNT(*)) OVER (PARTITION BY User, Rating ORDER BY User, Rating)) AS Percentage
FROM
    Results
GROUP BY
    User, Rating
ORDER BY
    User, Rating