SQL Server : count types with totals by date change -


i need count value (m_id) @ each change of date (rs_date) , create column grouped rs_date has active total date.

so table is:

ep_id   oa_id   m_id m_startdate    rs_date --------------------------------------------     1   2001    5   1/1/2014       1/1/2014     1   2001    9   1/1/2014       1/1/2014     1   2001    3   1/1/2014       1/1/2014     1   2001    11  1/1/2014       1/1/2014     1   2001    2   1/1/2014       1/1/2014     1   2067    7   1/1/2014       1/5/2014     1   2067    1   1/1/2014       1/5/2014     1   3099    12  1/1/2014       3/2/2014     1   3099    14  2/14/2014      3/2/2014     1   3099    4   2/14/2014      3/2/2014

so goal 

rs_date   active ----------------- 1/1/2014    5 1/5/2014    7 3/2/2014    10

if m_startdate = rs_date need count m_id , each rs_date not equal start date need count m_id , add m_startdate count , count next rs_date , add last active count.

i can basic counts 

(case when m_startdate <= rs_date         [m_id] end) test.

but stuck how result want.

any appreciated.

brian

-added in response comments using server ver 10

if using sql server 2012+ can use rows analytic/window functions:

;with cte (select rs_date                     ,count(distinct m_id) ct               table1               group rs_date               ) select *,sum(ct) over(order rs_date rows between unbounded preceding , current row) run_ct cte

demo: sql fiddle

if stuck using prior 2012 can use:

;with cte (select rs_date                     ,count(distinct m_id) ct               table1               group rs_date               ) select a.rs_date       ,sum(b.ct) cte left join cte b   on a.rs_date >= b.rs_date group a.rs_date

demo: sql fiddle


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