From: | Jerry Sievers <jerry(at)jerrysievers(dot)com> |
---|---|
To: | Peter Nixonn <listuser(at)peternixon(dot)net> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Calculating percentages in Postgresql |
Date: | 2006-11-21 14:38:52 |
Message-ID: | m3k61ouao3.fsf@homie.jerrysievers.com |
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Thread: | |
Lists: | pgsql-general |
Peter Nixonn <listuser(at)peternixon(dot)net> writes:
> Hi Guys
>
>
> Has anyone written a postgres function to calculate percentages without
> giving "ERROR: division by zero" when fed zeros?
>
One simple way to hack around this is wrap the problematic operand in
'nullif' and let it compute a null result where div by zero is
avoided.
jerry(at)jerry#
= \pset null 'Oops!'
Null display is "Oops!".
jerry(at)jerry#
= select 100 / nullif(num, 0) from generate_series(0,3) foo (num);
?column?
----------
Oops!
100
50
33
(4 rows)
jerry(at)jerry#
=
> --
>
> Peter Nixon
> http://www.peternixon.net/
> PGP Key: http://www.peternixon.net/public.asc
>
>
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--
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Jerry Sievers 305 854-3001 (home) Production Database Administrator
305 321-1144 (mobil WWW E-Commerce Consultant
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