RE: sql/function to calculate the median

From: Pardee, Roy E <roy.e.pardee_at_lmco.com>
Date: Tue, 22 Apr 2003 11:31:53 -0800
Message-ID: <F001.005872E7.20030422113153@fatcity.com>

(Since I've not seen any responses to this I'll give it a go.)

If you can use OLAP functions, have a look at PERCENTILE_CONT--that gives you any percentile you need--median is of course 50th.

There is a nice discussion of this & several candidate solutions in Celko's _SQL For Smarties_.

I was thinking you might be able to do something quick-n-dirty by counting the number of non-null values in the column whose median you need & then selecting out the value that falls at rownum = round(count/2,0) in a properly ordered result set. But I couldn't get that to work on a test table, so I won't post my code.

HTH,
-Roy

Roy Pardee
Programmer/Analyst
SWFPAC Lockheed Martin IT
Extension 8487

-----Original Message-----

Sent: Monday, April 21, 2003 12:12 PM
To: Multiple recipients of list ORACLE-L

Hi All,

Oracle 8.0.5
Does anyone have sql statement/functin to calculate the median?

Thanks
Rick

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Author: Pardee, Roy E
  INET: roy.e.pardee_at_lmco.com

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