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sql query grouping by time

Posted on 2014-03-06
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Last Modified: 2014-03-08
Dtime                                    points
2014-02-01 08:00                   .3
2014-02-01 08:15                   .2
2014-02-02 08:00                   .6
2014-02-03 08:00                   .9
2014-02-02  08:15                  .85
2014-02-04  08:00                  .98

I want to group by the time and add the ones that are over .8 and divide by the total
so for above example it will be
8:00----2/4
8:15---1/2
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Question by:Angela4eva
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by:DrewKjell
ID: 39910790
select DATEPART(hh, dtime) as hour, DATEPART(mm,dtime), SUM(CASE WHEN points >.8 then 1 else 0 end))/count('s')
from [table]
group by DATEPART(hh, dtime) as hour, DATEPART(mm,dtime)

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Scott Pletcher earned 500 total points
ID: 39911120
SELECT
    DATEADD(MINUTE, DATEDIFF(MINUTE, 0, Dtime) / 15 * 15, 0) AS DTime,
    SUM(CASE WHEN points > 0.8 THEN 1 ELSE 0 END) / COUNT(*) AS points
FROM ...
GROUP BY     DATEADD(MINUTE, DATEDIFF(MINUTE, 0, Dtime) / 15 * 15, 0)
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