Split date range without Calendar table

Question

Hi guys!
Is there any way to split date ranges (to days / hours / minutes) in one table without using Calendar table (without joining 2 tables)?
Reason I'm asking this is because we have a huge Fact table (500+ million records) and joining small Calendar table and this huge Fact table takes considerable amount of time.
So far we tried:
Join 2 tables (Fact and Calendar)
Cross Applying Calendar and table-valued function (that returns necessary measures from Fact table)
and both approaches took few minutes for 1 day to complete.
Most successful test we had so far was using CLR and executing table-valued functions in parallel for different 15 minute periods. This way we were able to get the results in 3-4 seconds.
Anyway, is there any effective pure T-SQL way to accomplish this?
Thanks in advance,
Miljan

Answer 1

Try using a temporary table rather than table variable.. You can have a CI on the date column.
or
declare @PeriodStart datetime2(0) = '2013-01-05 00:00:00'
declare @PeriodEnd datetime2(0) = '2013-01-05 02:00:00'
select T.PeriodStart, T.PeriodEnd, count(Column1)as count1, sum(Column2)as sum1
from Fact F with(nolock)WHERE F.[Start]>= '19000101' AND <=@PeriodStartand F.[End] >= @PeriodEnd and F.[End] <='20200101'
group by T.PeriodStart, T.PeriodEnd
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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