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Random Number Generator


Random Number Generator

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todd.ayers
todd.ayers
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I am trying to create a random number generator that would populate a number between 8-48 to 9 different lanes with the only criteria being that each lane number cannot be within 5 of any lane within 3 spaces of it. So what I mean is if lane 4 has a number of 30 then lane 1-2-3 and lane 5-6-7 cannot be within 5 of lane 4's number. Hope this makes sense and any help would be sincerely appreciated....
ChrisM@Work
ChrisM@Work
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todd.ayers (4/30/2013)
I am trying to create a random number generator that would populate a number between 8-48 to 9 different lanes with the only criteria being that each lane number cannot be within 5 of any lane within 3 spaces of it. So what I mean is if lane 4 has a number of 30 then lane 1-2-3 and lane 5-6-7 cannot be within 5 of lane 4's number. Hope this makes sense and any help would be sincerely appreciated....


No problem. Folks here love this sort of question! Here's a solution for openers:
;WITH SemiRandomNumbers AS (
SELECT Lane = 8 + ABS(CHECKSUM(NEWID()))%41
FROM syscolumns a
)
SELECT *
FROM (SELECT ID = 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) s
CROSS APPLY (
SELECT TOP 1 Lane1 = Lane FROM SemiRandomNumbers --ORDER BY (SELECT NULL)
) l1
CROSS APPLY (
SELECT TOP 1 Lane2 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l1.Lane1-5 AND l1.Lane1+5)
) l2
CROSS APPLY (
SELECT TOP 1 Lane3 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l1.Lane1-5 AND l1.Lane1+5)
AND NOT (r.Lane BETWEEN l2.Lane2-5 AND l2.Lane2+5)
) l3
CROSS APPLY (
SELECT TOP 1 Lane4 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l1.Lane1-5 AND l1.Lane1+5)
AND NOT (r.Lane BETWEEN l2.Lane2-5 AND l2.Lane2+5)
AND NOT (r.Lane BETWEEN l3.Lane3-5 AND l3.Lane3+5)
) l4
CROSS APPLY (
SELECT TOP 1 Lane5 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l2.Lane2-5 AND l2.Lane2+5)
AND NOT (r.Lane BETWEEN l3.Lane3-5 AND l3.Lane3+5)
AND NOT (r.Lane BETWEEN l4.Lane4-5 AND l4.Lane4+5)
) l5
CROSS APPLY (
SELECT TOP 1 Lane6 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l3.Lane3-5 AND l3.Lane3+5)
AND NOT (r.Lane BETWEEN l4.Lane4-5 AND l4.Lane4+5)
AND NOT (r.Lane BETWEEN l5.Lane5-5 AND l5.Lane5+5)
) l6
CROSS APPLY (
SELECT TOP 1 Lane7 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l4.Lane4-5 AND l4.Lane4+5)
AND NOT (r.Lane BETWEEN l5.Lane5-5 AND l5.Lane5+5)
AND NOT (r.Lane BETWEEN l6.Lane6-5 AND l6.Lane6+5)
) l7
CROSS APPLY (
SELECT TOP 1 Lane8 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l5.Lane5-5 AND l5.Lane5+5)
AND NOT (r.Lane BETWEEN l6.Lane6-5 AND l6.Lane6+5)
AND NOT (r.Lane BETWEEN l7.Lane7-5 AND l7.Lane7+5)
) l8
CROSS APPLY (
SELECT TOP 1 Lane9 = Lane FROM SemiRandomNumbers r
WHERE NOT (r.Lane BETWEEN l6.Lane6-5 AND l6.Lane6+5)
AND NOT (r.Lane BETWEEN l7.Lane7-5 AND l7.Lane7+5)
AND NOT (r.Lane BETWEEN l8.Lane8-5 AND l8.Lane8+5)
) l9



“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
todd.ayers
todd.ayers
Valued Member
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Points: 59 Visits: 120
ok... so how can I test this to see if works? What part should I look at or copy?
ChrisM@Work
ChrisM@Work
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Copy the lot, paste it into an SSMS window and execute it.

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
todd.ayers
todd.ayers
Valued Member
Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)

Group: General Forum Members
Points: 59 Visits: 120
well..... Darn.. I dont have SQL on my desktop... only access 2007
ChrisM@Work
ChrisM@Work
SSCrazy Eights
SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)

Group: General Forum Members
Points: 9028 Visits: 19041
todd.ayers (4/30/2013)
well..... Darn.. I dont have SQL on my desktop... only access 2007


Sorry, I can only guarantee that it will run in SQL Server 2008 - this is, after all, the SQL Server 2008 forum section :-D

Access will probably want to join it to a database down the network somewhere and plug on a front end with user toys. Be firm.

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
todd.ayers
todd.ayers
Valued Member
Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)

Group: General Forum Members
Points: 59 Visits: 120
Thx Bro I really really appreciate all your help!!!!
ChrisM@Work
ChrisM@Work
SSCrazy Eights
SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)

Group: General Forum Members
Points: 9028 Visits: 19041
todd.ayers (4/30/2013)
Thx Bro I really really appreciate all your help!!!!


BRO?!!! Are you an old git too?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
todd.ayers
todd.ayers
Valued Member
Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)Valued Member (59 reputation)

Group: General Forum Members
Points: 59 Visits: 120
LOL!! yeah sorry hope I didnt offend you?
ChrisM@Work
ChrisM@Work
SSCrazy Eights
SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)SSCrazy Eights (9K reputation)

Group: General Forum Members
Points: 9028 Visits: 19041
todd.ayers (4/30/2013)
LOL!! yeah sorry hope I didnt offend you?


Heck no!
Have you tested the code yet?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Go


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