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Random number generator


Random number generator

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sudrav
sudrav
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Ok.Guys I need your help. I have a table of about 60000 records. I want to add a column say random number and store it in the table

1. I want to generate a random number for each row and store it in the table

2. I do not want to write a seperate function and call it. I want to do it in one step .is it possible ?
RBarryYoung
RBarryYoung
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What range and what datatype?

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
RBarryYoung
RBarryYoung
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Oh, and "how" random? Linear congruential differentiator random? Cryptographically strong random? More? Or less? Or in-between?

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Jeff Moden
Jeff Moden
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sudrav (10/15/2008)
Ok.Guys I need your help. I have a table of about 60000 records. I want to add a column say random number and store it in the table

1. I want to generate a random number for each row and store it in the table

2. I do not want to write a seperate function and call it. I want to do it in one step .is it possible ?


Pick one...

DROP TABLE JBMTest
GO
--===== Create and populate a 1,000,000 row test table.
-- Column "RowNum" has a range of 1 to 1,000,000 unique numbers
-- Column "SomeInt" has a range of 1 to 50,000 non-unique numbers
-- Column "SomeLetters2" has a range of "AA" to "ZZ" non-unique 2 character strings
-- Column "SomeMoney has a range of 0.0000 to 99.9999 non-unique numbers
-- Column "SomeDate" has a range of >=01/01/2000 and <01/01/2010 non-unique date/times
-- Column "SomeCSV" contains 'Part01,Part02,Part03,Part04,Part05,Part06,Part07,Part08,Part09,Part10'
-- for all rows.
-- Column "SomeHex12" contains 12 random hex characters (ie, 0-9,A-F)
-- Jeff Moden
SELECT TOP 1000000
RowNum = IDENTITY(INT,1,1),
SomeInt = ABS(CHECKSUM(NEWID()))%50000+1,
SomeLetters2 = CHAR(ABS(CHECKSUM(NEWID()))%26+65)
+ CHAR(ABS(CHECKSUM(NEWID()))%26+65),
SomeCSV = CAST('Part01,Part02,Part03,Part04,Part05,Part06,Part07,Part08,Part09,Part10' AS VARCHAR(80)),
SomeMoney = CAST(ABS(CHECKSUM(NEWID()))%10000 /100.0 AS MONEY),
SomeDate = CAST(RAND(CHECKSUM(NEWID()))*3653.0+36524.0 AS DATETIME),
SomeHex12 = RIGHT(NEWID(),12)
INTO dbo.JBMTest
FROM Master.dbo.SysColumns t1
CROSS JOIN Master.dbo.SysColumns t2

--===== A table is not properly formed unless a Primary Key has been assigned
ALTER TABLE dbo.JBMTest
ADD PRIMARY KEY CLUSTERED (RowNum)



--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
RBarryYoung
RBarryYoung
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So that's in-between LGD and Cryptographic? And I don't see any varbinary(MAX) or sql_variant data-types. BigGrin

-- RBarryYoung, (302)375-0451 blog: MovingSQL.com, Twitter: @RBarryYoung
Proactive Performance Solutions, Inc.
"Performance is our middle name."
Jeff Moden
Jeff Moden
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rbarryyoung (10/15/2008)
So that's in-between LGD and Cryptographic? And I don't see any varbinary(MAX) or sql_variant data-types. BigGrin


Heh... no... It's somewhere in between a pork chop and a chicken leg. Tongue

--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
Matt Miller (4)
Matt Miller (4)
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Jeff - enquiring minds wanna know - how are you getting your code windows to scroll side to side?

----------------------------------------------------------------------------------
Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?
Jeff Moden
Jeff Moden
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Matt Miller (10/15/2008)
Jeff - enquiring minds wanna know - how are you getting your code windows to scroll side to side?


I think Steve's in-house Ninja tweeked the forum code for it very recently...

--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
battula.praveen
battula.praveen
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Points: 164 Visits: 14
See this small example and check that helps.
http://praveenbattula.blogspot.com/2009/05/how-to-generate-random-numbers-in-t-sql.html
Jeff Moden
Jeff Moden
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battula.praveen (3/29/2010)
See this small example and check that helps.
http://praveenbattula.blogspot.com/2009/05/how-to-generate-random-numbers-in-t-sql.html


The only problem with that is that it uses RAND() alone and is good for only one row at a time.

--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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