sql - Populating a Datetime Column -


i want populate datetime column on fly within stored procedure. below query have same slows down query performance.

create table #taxval (     id         int     , paiddate datetime     , custid   int     , compid   int  )  insert #taxval(id, paiddate, custid, compid) values(01, '20150201',12, 100)     , (03,'20150301', 18,101)     , (10,'20150401',19,22)     , (17,'20150401',02,11)     , (11,'20150411',18,201)     , (78,'20150421',18,299)     , (133,'20150407',18,101)  --  select * #taxval  declare @startdate datetime = '20150101'     , @enddate     datetime = '20150501'  declare @tab table  (     compid    int     , datefield datetime )  declare @t int set @t = 0 while @enddate >= @startdate + @t  begin     insert @tab      select compid          , @startdate + @t datefield     #taxval     custid = 18         , compid = 101     order datefield desc      set @t = @t + 1 end  select distinct * @tab   drop table #taxval

which best way write query better performance?

change this:

declare @t int set @t = 0 while @enddate >= @startdate + @t  begin     insert @tab  select compid      , @startdate + @t datefield #taxval custid = 18     , compid = 101 order datefield desc  set @t = @t + 1 end

to this:

;with cte as( select cast('20150101' date) d union select dateadd(dd, 1, d) d cte d < '20150501' ) insert @tab select compid, d #taxval  cross join cte custid = 18 , compid = 101 option(maxrecursion 0)

here recursive common table expression dates in range. cross join , insert. notice there no sense order set while inserting.


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