Comments on: The integers table

By: sage

sage — Mon, 29 Sep 2008 23:36:45 +0000

Jeremy, there isn’t an identity in mysql, is there?

Xaprb, am not seeing how this plus the code in your page on char-dump work together since your integer table ends up being 0-9. There’s no doubt a better way, but I created a larger integer table via a temporary 0-9 table:

create table Uintegers(i int unsigned not null);
create table integers(i int unsigned not null);
insert into Uintegers(i) values (0), (1), (2), (3), (4), (5), (6), (7), (8), (9);

(like yours so far)
Then, use this table of 9 as workspace to create the needed collection of integers (0-999):

insert into integers (
select (hundreds.i * 100) + (tens.i * 10) + units.i as iii
from Uintegers as units
cross join Uintegers as tens
cross join Uintegers as hundreds );

Then, to clean up:

drop table Uintegers;

By: Jeremy West

Jeremy West — Wed, 07 May 2008 16:59:25 +0000

I came accross this blog trying to learn more about Tally Tables, anyway here something else I found that does what your showing above, but faster if your interested. (Ran in about 1/9th the time for 100,000 numbers) Cool Blog, hope that book is comming well.

DECLARE @StartTime DATETIME –Timer to measure total
SET @StartTime = GETDATE() –Start the timer

SELECT TOP 100000
IDENTITY(INT,1,1) AS N
INTO dbo.Tally
FROM Master.dbo.SysColumns sc1,
Master.dbo.SysColumns sc2

Select * From Tally

Drop table Tally
SELECT STR(DATEDIFF(ms,@StartTime,GETDATE())) ‘ Milliseconds duration’

By: Xaprb

Xaprb — Sat, 05 Aug 2006 21:45:58 +0000

Ah yes, I see you have written articles about this topic too! I forget now who I originally got the idea from, but it's out there in a number of places (no pun intended). Thanks for the compliment!

By: rudy

rudy — Sat, 04 Feb 2006 19:03:29 +0000

Thank you for providing the link to "someone else's idea." ;o)

[Takes quick look around] hey, fabulous site, and some great contents.

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