Generate N numbers

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Generate N numbers

harsha.majety

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April 4, 2013 at 8:20 pm

#276095

Comments posted to this topic are about the item Generate N numbers

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Steve JP Ten Centuries Points: 1070 More actions · Answer 1

Interesting.

Or old school:

select distinct Number from master.dbo.spt_values where number between 0 and 1000

Another one I have seen is:

;With CTE ( [Number] ) as (

select Number = '0'

union select Number = '1'

union select Number = '2'

union select Number = '3'

union select Number = '4'

union select Number = '5'

union select Number = '6'

union select Number = '7'

union select Number = '8'

union select Number = '9'

)

Select [Number]

from (

select [Number] = cast([3sp].[Number] + [2sp].[Number] + [1sp].[Number] as varchar(10))

from CTE as [1sp]

cross join CTE as [2sp]

cross join CTE as [3sp]

) as x

where [Number] between 0 and 1000

order by 1

But the best in a way is a tally table which can be indexed and used in a query plan.

A slight problem that you might have with a recursive CTE is that the ".....the MAXRECURSION option exceeds the allowed maximum of 32767"

Jeff Moden SSC Guru Points: 1004280 More actions · Answer 2

@harsha-2 (and ayoe else interested),

Thanks for taking the time to post a script but you have to be very careful with recursive CTEs. Please read the following article for why you should almost never use a recursive CTE to count. To summarize and contrary to what you published, they are far from "quick" an shouldn't be used even for the smallest of counts.

http://www.sqlservercentral.com/articles/T-SQL/74118/

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)