Select
DATEPART(year, the_column) as year
,DATEPART(dayofyear,the_column) as day
,DATEPART(hh, the_column) as hour
,DATEPART(mi,the_column) as minute
,DATEPART(ss, the_column) as second
,count(*) as count from t
Group By
DATEPART(year, the_column)
, DATEPART(dayofyear,the_column)
, DATEPART(hh, the_column)
, DATEPART(mi,the_column)
, DATEPART(ss, the_column)
order by count desc



