find,largest,Smallest,valueNumbers,from,Table
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nth largest/smallest from a table

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Submitted on: 12/18/2001 12:22:58 AM
By: MuraliKrishna Vedagiri 
Level: Intermediate
User Rating: By 5 Users
Compatibility:SQL Server 7.0, SQL Server 6.5 and earlier, Informix , Oracle, Other

Users have accessed this code 2469 times.
 
 
     To find Nth largest and Smallest 'value'(Numbers) from a Table.
 
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--**************************************
--     
-- Name: nth largest/smallest from a tab
--     le
-- Description:To find Nth largest and S
--     mallest 'value'(Numbers) from a Table.
-- By: MuraliKrishna Vedagiri
--
-- Inputs:The N: The index of the larges
--     t/smallest number.
--
-- Returns:Largest / Smallest
--
-- Assumes:SImple SQL knowledge
--
--This code is copyrighted and has-- limited warranties.Please see http://
--     www.Planet-Source-Code.com/xq/ASP/txtCod
--     eId.374/lngWId.5/qx/vb/scripts/ShowCode.
--     htm--for details.--**************************************
--     

SELECT a.itemid FROM item a WHERE (n-1) = (select count(*) from item b where b.itemid > a.itemid)
/** BY changing > TO < you can get Smallest Number **
** IF you want TO find the 4th largest, THEN 4-1 =3 in place OF (n-1)/

 
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Other User Comments
12/18/2001 6:19:50 AM:James Travis
This is great, works as promised.
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12/18/2001 9:28:45 AM:kevin
why can't you just use...
SELECT TOP n 
[PERCENT] a, b FROM myTable
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12/18/2001 9:51:29 AM:Srinivas VM
Perfect and neat.
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6/13/2002 7:29:28 AM:Sushil Daga
Wonderful. but will fail if there are 
multiple records with the same value, 
instead use:
SELECT a.itemid FROM 
item a WHERE (n-1) = (SELECT 
COUNT(distinct b.itemid) FROM item b 
WHERE b.itemid > a.itemid)
if no 
duplicate values then use this for 
better performance:
SELECT a.itemid 
FROM item a WHERE (n-1) = (SELECT 
COUNT('x') FROM item b WHERE b.itemid > 
a.itemid)
Please note: My solution 
will work perfectly on oracle.
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6/27/2002 12:36:07 PM:Roger
excelent
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7/1/2002 4:44:51 PM:vinnie
why not use ">=" in 
"where b.itemid > 
a.itemid" so that you don't need to 
subtract 1 from n?
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