Using MAX(Time) and MAX(Date) to get only the latest per group - sql

Question

I want to get the latest highscore, per user, per game. My current query isn't working.
I have a SQL DB like the following:
player(string) game(string) score(int) Date(Date) time(Time)
jake soccer 20 2016/02/26 10:00:00
jake chess 50 2016/02/26 10:00:00
jake soccer 40 2016/02/26 13:00:00
jake chess 30 2016/02/26 13:00:00
jake soccer 20 2016/02/26 15:00:00
jake chess 60 2016/02/26 15:00:00
jake soccer 80 2016/02/26 18:00:00
jake chess 10 2016/02/26 18:00:00
mike chess 30 2016/02/26 13:00:00
mike soccer 20 2016/02/26 15:00:00
mike chess 60 2016/02/26 15:00:00
mike soccer 80 2016/02/26 18:00:00
mike chess 10 2016/02/26 18:00:00
What I want to get out of it is:
jake soccer 80 2016/02/26 18:00:00
jake chess 10 2016/02/26 18:00:00
mike soccer 80 2016/02/26 18:00:00
mike chess 10 2016/02/26 18:00:00
I found out the Time column also has the date, so this should work.
This is my current Query:
SELECT t1.*
FROM db t1
INNER JOIN (
SELECT player, MAX(time) TS
FROM db
GROUP BY player
) t2 ON t2.player = t1.player and t2.TS = t1.time
ORDER BY score DESC";
EDIT: I'm getting lots of wrong rows. Basically. I'm getting them sorted by time, but not the date
I now need to sort them not only by MAX(Time) but MAX(Date) as well. Or merge Date and Time in a new var

Answer 1

To get the latest highscore, per user, per game, try this:
;WITH cte as (
SELECT player, game, MAX(convert(datetime,cast([date] as nvarchar(10)) + ' '+ cast([time] as nvarchar(10)))) TS
FROM db
GROUP BY player, game)
SELECT db.*
FROM cte
LEFT JOIN db ON cte.player = db.player and cte.game = db.game and cte.TS = convert(datetime,cast(db.[date] as nvarchar(10)) + ' '+ cast(db.[time] as nvarchar(10)))
ORDER BY highscore DESC

Answer 2

Try using ROW_NUMBER()
SELECT
t1.*
FROM (
SELECT
*
, ROW_NUMBER() OVER (PARTITION BY player ORDER BY [time] DESC) AS rn
FROM db
) AS t1
WHERE rn = 1
;

Answer 3

Since you want not just the most recent game but also its score, this question can use the same patterns discussed here: Select first row in each GROUP BY group?
Personally I think picking the most recent time and then using that to match rows in the outer query is a little scary, since someone just might have two games at the same instant. Also it won't give you the best performance. Depending on your RDBMS, the linked question might have better approaches.