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Re: BUG #3230: Division problem

From: Jon Sime <jsime(at)mediamatters(dot)org>
To: Jeferson Kasper <jefersonkasper(at)gmail(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #3230: Division problem
Date: 2007-04-16 18:18:27
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
Jeferson Kasper wrote:
> The following bug has been logged online:
> Bug reference:      3230
> Logged by:          Jeferson Kasper
> Email address:      jefersonkasper(at)gmail(dot)com
> PostgreSQL version: 8.1.5
> Operating system:   Linux RedHat 9
> Description:        Division problem
> Details: 
> i was trying to divide a number and the result is always wrong, and i tried
> to calculate in psql this query:
> select (30/50);
> and the result was zero ( 0 ), and it have to be 0.6...
> i dont know what i have done wrong... but, i think its a bug.
> thanks for all.
> Jeferson Kasper

Operations on integer arguments will return an integer result. To get
the value you're expecting from that division, you'll need to cast one
of the numbers to a floating point type.

Any of the following will produce the result you wanted:

    select cast(30 as real) / 50;
    select cast(30 as numeric) / 50;
    select 30::real / 50;
    select 30 / 50::float;

As well as any other variations along that theme.


Senior Systems Developer
Media Matters for America

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Subject: Re: BUG #3230: Division problem

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