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Percentile function

Posted on 2002-06-28
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Last Modified: 2007-11-27
HI

I badly need a percentile function, it something like this

 getPercentile (value,set)

I am hoping that there might be an extended stored
procedure or something similar that we can use.

Currently we do not have the option of using SQL 2000
Analysis Services.

Any help is greatly appreciated.

Thanks,
syam
0
Comment
Question by:syamsundar
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4 Comments
 
LVL 35

Expert Comment

by:David Todd
ID: 7123540
Hi,

Are you using SQL 2000?

Can this be writtern as a user defined function?

Regards
  David
0
 

Author Comment

by:syamsundar
ID: 7124527
Yes i am using sql 2000. A user defined function will do.
0
 
LVL 35

Accepted Solution

by:
David Todd earned 200 total points
ID: 7125568
Hi,

Isn't the percentile just the score / possible * 100?

Is this what you are looking for?

drop function Percentile
go

create function Percentile( @score as integer, @Possible as integer )
returns integer
as
begin
     declare @Percent     integer

     if @Possible != 0
          set @Percent = ( cast( @Score as float ) * 100.0 / cast( @Possible as float ))
     else
          set @Percent = 0

     return( @Percent )
 
end

select dbo.Percentile( 43, 233 ) as percentile


gives

percentile  
-----------
18

(1 row(s) affected)

Note that I had to cast the parameters to floats to get the division to work, and also moved the * 100 to get better accuracy.

Regards
  David
0
 

Author Comment

by:syamsundar
ID: 7127131
todd,

Thank you very much.
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