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Microsoft SQL Server: Programming FAQ
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Random Numbers
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How Can I Generate a Series of Random Integers With T-SQL?
Posted: 3 Oct 01
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Here is a stored procedure that will generate a series of random numbers and return them in a result set.
/* This SQL Server stored procedure returns a result set containing a series of random integers
Inputs are: @begin_no - lowest number to be generated, @end_no - highest number to be generated
Calling syntax: Exec sp_GenerateRandomNumberResultSet Begin, End
Created by Terry L. Broadbent, Oct 3 2001
Please inform me of any bugs encountered. Comments and suggestions for improvement are encouraged. */
CREATE procedure sp_GenerateRandomNumberResultSet @begin_no int=1, @end_no int=100 As
Set nocount on
Declare @rn int, @rec int, @cnt int Set @cnt=@end_no-@begin_no+1
Create Table #t (RecNo int identity(1,1), RandNo int null)
Set @rec=1 While @rec<=@cnt Begin Insert Into #t (RandNo) Values (null) Set @rec=@rec+1 End
Set @rec=1 While @rec<=@cnt Begin Set @rn=rand()*@cnt+@begin_no If @begin_no<0 Set @rn=@rn-1 Update #t Set RandNo=@rn Where RecNo=@rec And @rn Not In (Select RandNo From #t Where RandNo Is Not Null) If @@rowcount>0 Set @rec=@rec+1 End
Set nocount off
Select RandNo From #t
Drop Table #t Go |
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