Generating unique/random set of co-ordinates

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Generating unique/random set of co-ordinates

Author

Topic

jsawyer
Starting Member

2 Posts

Posted - 2010-05-16 : 04:27:23

Hi, I'm fairly new to using SQL and have never really used it to its' full potential. My main question is, could SQL handle the task I'm wanting and if so, how?

I'm wanting to generate a random set of co-ordanates (x, y) that are unique as sets and not individual numbers. If I could also make it so they are not COMPLETELY random, as in, the first one is around (0,0) meaning the next one will be close to that sort of position, say (2,3) instead of making (100,100).

Any help is most appreciated, thanks in advance!

-Joseph Sawyer

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2010-05-16 : 04:34:37

Yes. Use RAND() function with a proper seed.

N 56°04'39.26"
E 12°55'05.63"

jsawyer
Starting Member

2 Posts

Posted - 2010-05-16 : 05:57:29

Thanks for your reply. How exactly would I go about doing that?

-Joseph Sawyer

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2010-05-16 : 07:32:24

see

http://sqlblogcasts.com/blogs/madhivanan/archive/tags/random+numbers/default.aspx

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2010-05-16 : 07:33:09

SELECT FLOOR(5 * RAND()) AS x,
FLOOR(5 * RAND()) AS y
FROM master..spt_values
WHERE Type = 'P' AND Number BETWEEN 1 AND 6

or

SELECT	TOP(10)
	x,
	y
FROM	(
		SELECT	DISTINCT
			CHECKSUM(NEWID()) % 10 AS x,
			CHECKSUM(NEWID()) % 10 AS y
		FROM	master..spt_values
	) AS d

N 56°04'39.26"
E 12°55'05.63"

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