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TSQL that lists all numbers from 1..100


TSQL that lists all numbers from 1..100

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Eli Leiba
Eli Leiba
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Comments posted to this topic are about the item TSQL that lists all numbers from 1..100
Jeff Moden
Jeff Moden
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Gosh, Eli. Thanks for sharing but please consider the following, instead. It's faster, still doesn't require access to a table, can produce a much larger range of numbers, and takes a whole lot fewer rows of code especially for what it does.

WITH
E1(N) AS (SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL
SELECT 1), --10E1 or 10 rows
E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E2 or 100 rows
E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E3 or 10000 rows
E8(N) AS (SELECT 1 FROM E4 a, E4 b), --10E4 or 100000000 rows
E16(N) AS (SELECT 1 FROM E8 a, E8 b) --10E16 or more rows than you can shake a stick at
SELECT TOP (@DesiredRowCount) N = ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E16
;



--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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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GPO
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Who was the first person to come up with this (Jeff's) idea in the context of SQL Server? Was it Itzik Ben-Gan?

:-)

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Jeff Moden
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GPO (2/20/2012)
Who was the first person to come up with this (Jeff's) idea in the context of SQL Server? Was it Itzik Ben-Gan?


Yes, it was Ben-Gan. He used a binary set of CTE's instead of a decimal set like many of us do here. If you'd like to see a comparison of some methods for counting, please see the following article.
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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
ThomasGr
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Try this one:

with t as (select 1 x
union all
select x + 1
from t
where x < 100)
select x
from t
Cadavre
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ThomasGr (2/20/2012)
Try this one:

with t as (select 1 x
union all
select x + 1
from t
where x < 100)
select x
from t


Read the article that Jeff pointed at to see why that isn't a good idea.


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Jeff Moden
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ThomasGr (2/20/2012)
Try this one:

with t as (select 1 x
union all
select x + 1
from t
where x < 100)
select x
from t


Thomas, read the article at the link I provided in my last post and see why that's even worse than the original suggestion on this thread. Certainly, it's one of the worse ways of counting.

--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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
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