Reg: Generating Random Integers:

Hi Experts,
Sorry for resurrecting my old thread - https://forums.oracle.com/message/10928049
Like Frank Kulash suggested (his last post in above thread):
As you probably noticed, the results discriminated against 1 and 9. That's because numbers were being rounded up or down to produce the integers 1 through 9, but no numbers were being rounded up to produce 1, and no numbers were rounded down to produce 9. A correct way to use ROUND would be
ROUND (dbms_random.value (.5, 9.5))
But surprisingly I'm even getting values 1 & 9 for the below query :
SELECT ROUND(Dbms_Random.Value(1,9))
FROM dual
CONNECT BY LEVEL<=100;
Can any body please confirm the behavior?
-- Ranit
(Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production)

you can check it own:
select round(x), x
from (SELECT Dbms_Random.Value(1, 9) x FROM dual CONNECT BY LEVEL <= 100)
1
1.00958727824362
1
1.35929462261339
1
1.07313087362894
1
1.39541607620187
1
1.08796277513722
1
1.43183190420528
1
1.09560186845415
2
2.35974832899944
2
2.3158341880934
2
1.52599047556987
2
2.37974359986276
2
2.30530327837917
2
1.8378556505608
2
2.41909513356704
2
1.74907912713616
2
1.72229810527042
2
2.1597745913138
2
2.06440750487121
2
2.0982190056438
2
2.0524769645307
3
3.35866001787213
3
3.14315892893997
3
2.53135843876159
3
3.23420560645603
3
3.15189114083364
3
2.97194582374213
3
2.73660206717264
3
2.69963724656505
3
3.21827931224339
4
4.15095159638964
4
4.16837167062646
4
3.72720254703438
4
3.5526690440214
4
3.55135374008975
4
4.19651566843293
4
4.36909714236384
4
3.56919854311661
4
3.89110676776102
4
4.0032340954152
4
3.53066148833693
4
4.13774817145481
4
3.86385674199289
4
4.30630900569414
4
3.98754993886356
4
4.43506599962048
5
4.54644810937981
5
5.27518693946758
5
4.93169654030369
5
4.68379021519564
5
5.4611403838419
5
4.71614031502033
5
4.93384285302108
5
5.07864957182936
5
4.72839176497723
5
4.85928177025523
5
4.53668745820041
5
4.97080767362867
6
5.61561080199998
6
5.85655646004377
6
6.1589737356415
6
6.46305497906528
6
5.54811527048922
6
6.30284273722328
6
6.30841844527289
6
6.40877037889211
6
6.14573053625073
6
5.79316621696824
6
5.51060861608968
6
5.88458765184622
6
5.68647227362169
6
5.58700573867026
6
6.22599345108297
7
7.4727041682604
7
7.38751225576785
7
7.49520896175461
7
6.73749527136869
7
7.46447932276796
7
6.57501612096089
7
7.13414219171924
7
6.93607163430359
7
6.52046182960753
7
7.2919103873137
7
6.74420595435779
8
8.43594139193597
8
7.68159185404298
8
8.01081476121886
8
8.41476778128371
8
8.45086248066315
8
7.83571427701249
8
7.71937441043553
8
7.86887882882576
8
8.39486930439563
8
7.83419765228732
8
8.42089354134024
8
7.71481978000627
9
8.68275277706912
9
8.75989388835502
9
8.811043149848
9
8.50885631647746
9
8.94065319543239
Ramin Hashimzade

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Hi,
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If you had a lottery with 10 people participating, and you wanted to fix it so that 5 of the people were twice as likely to win as the other 5, what could you do? One thing you could do is to give 2 tickets to the first 5 people, but only 1 ticket to the other 5. Since you have 15 tickets now, you'd pick a random integer in the range 1-15.
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Edited by: haraminoI on Mar 23, 2009 2:24 PM
Edited by: haraminoI on Mar 23, 2009 2:25 PM
Edited by: haraminoI on Mar 23, 2009 2:26 PM
Edited by: haraminoI on Mar 23, 2009 2:26 PM
Edited by: haraminoI on Mar 23, 2009 2:27 PM

haraminoI wrote:
doremifasollatido wrote:
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Reg: Generating Random Integers:

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