Comments on: The Aggregate Function PRODUCT()

By: Erik Eckhardt

Erik Eckhardt — Thu, 17 Mar 2011 23:24:52 +0000

The earliest hit I find via google is:

http://planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=159&lngWId=5
Submitted by Umachandar on 7/25/2000 8:42:10 PM
http://www.umachandar.com/

By: Jes Schultz Borland

Jes Schultz Borland — Wed, 09 Mar 2011 02:45:21 +0000

Cool stuff, Michael. Thanks for sharing!

By: Michael J. Swart

Michael J. Swart — Wed, 09 Mar 2011 02:43:16 +0000

Hi Naomi,
Thanks for the link. It’s interesting that it got mentioned by my friend Brad Shulz in that thread.

In my post I linked to a google search above (and fixed the link just now). I was pointing to the search http://www.google.com/search?q=%2B%22EXP+SUM+LOG%22+%2Bsql which shows thousands of people who have discovered this before I did. C’est la vie.

But none of them feature a picture of the Slap Chop guy do they

By: Naomi

Naomi — Wed, 09 Mar 2011 02:22:03 +0000

Nice, although we did touch it briefly also in this thread Lightning Fast Hybrid RUNNING TOTAL - Can you slow it down?

By: Michael J Swart

Michael J Swart — Tue, 08 Mar 2011 03:25:55 +0000

Thanks Rob,
I left the mention of zeroes and negatives to keen commenters like yourself.

Cheers

By: Rob Farley

Rob Farley — Tue, 08 Mar 2011 02:13:11 +0000

No mention of negatives and zeroes? (I guess inflation multipliers are always positive, so it’s fair enough)

(1 – 2*(COUNT(case when inflationRate < 0 then 1 end) % 2)) * MIN(case when inflationRate = 0 then 0 else 1 end) * EXP(SUM(LOG(ABS(NULLIF(inflationRate,0)))))

All good though – it's nice to be reminded of this stuff.

Rob