From: Kachun Lee <kachun@pathlink.com>
To: pgsql-sql@hub.org
Subject: Re: [SQL] isnull function]
Date: Fri, 26 Jun 1998 13:33:17 -0700
Message-ID: <3.0.1.32.19980626133317.006bc8cc@rr.pathlink.com> (raw)
In-Reply-To: <199806261913.PAA01028@candle.pha.pa.us>
References: <3.0.1.32.19980626104203.006aadc4@rr.pathlink.com>
At 03:13 PM 6/26/98 -0400, you wrote:
>>
>> Is there an isnull function avaliable in postgres, such as:
>>
>> select isnull(dt_field, 'now') ...
>>
>> Thanks
>>
>>
>
>I don't tbink so, but it would be nice. I think Ingres has it. It also
>would not be hard to write as a loadable function.
>
>--
>Bruce Momjian | 830 Blythe Avenue
>maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026
> + If your life is a hard drive, | (610) 353-9879(w)
> + Christ can be your backup. | (610) 853-3000(h)
>
I tried, but the following code does not seem to work:
#include <string.h>
#include <stdio.h>
#include "postgres.h"
#include "libpq-fe.h"
#include "utils/dt.h"
DateTime * is_null(DateTime *, DateTime *);
DateTime * is_null (DateTime * dt, DateTime * def)
{
return dt ? dt : def;
}
I searched the doc/maillist, and I could not find how to test an arg for
NULL value. Should I post this to HACKER?
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To: pgsql-sql@postgresql.org
Cc: kachun@pathlink.com, pgsql-sql@hub.org
Subject: Re: [SQL] isnull function]
In-Reply-To: <3.0.1.32.19980626133317.006bc8cc@rr.pathlink.com>
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