Re: getting around---division by zero on numeric

You could use a CASE statement...

select
type,
sum(sales),
sum(cost),
CASE WHEN sum(sales) <> 0 THEN (sum(sales) * sum(cost) / sum(sales)) *
100 ELSE 0 END
from test
group by 1

However, I guess that your example is just not what you really use as
sum(sales) * sum(cost) / sum(sales) seems very similar to sum(cost).....

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Patrick Fiche
email : patrick(dot)fiche(at)aqsacom(dot)com
tél : 01 69 29 36 18
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-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org]On Behalf Of Tim Nelson
Sent: mercredi 19 octobre 2005 14:27
To: pgsql-general(at)postgresql(dot)org
Subject: [GENERAL] getting around---division by zero on numeric

I am getting division by zero on a calculated field ( sum(sales) is 0 )
and I can't find a way around this. I figured out you can't use an
aggregate in a where, and using having the parser must (obviously)
evaluate the select fields before considering teh having clause.

Does anyone have a way around this? Thanks!

select
type,
sum(sales),
sum(cost),
(sum(sales) * sum(cost) / sum(sales)) * 100
from test
group by 1
having sum(sales) != 0

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