sql server - T-SQL count of unique records by each month -

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i trying count our customer base grew each month.

eg. "josh","tim" , "dustin" has used service in january, january number of new unique customers 3.

in february "josh","tim" , "eve" use service. "josh" , "tim" has used service before, number of new unique customers 1.

and on....

i wanted use except statement, not getting right results.

select count(distinct name) newuniquecustomers, convert(varchar(7), regdate, 126) t group convert(varchar(7), regdate, 126) except   --this should excludie customers included select count(distinct name)as newuniquecustomers, convert(varchar(7), regdate, 126) t  convert(varchar(7), dateadd(month,-1,regdate) , 126)  group convert(varchar(7), regdate, 126)

http://sqlfiddle.com/#!3/73621

using sqlfiddle should it.

with sorteddata (     select *         , row_number() over(partition name order regdate) rownum     t )  select dateadd(month, datediff(month, 0, regdate), 0)      , count(name) sorteddata sd sd.rownum = 1 group dateadd(month, datediff(month, 0, regdate), 0)

--edit--

given comment needing pull 2 tables union why not this?

with sorteddata (     select *         , row_number() over(partition name order regdate) rownum          (         select * productiontable          union          select * archive.dbo.t     )     x )

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