From: | Kachun Lee <kachun(at)pathlink(dot)com> |
---|---|
To: | pgsql-sql(at)hub(dot)org |
Subject: | Re: [SQL] isnull function] |
Date: | 1998-06-26 20:33:17 |
Message-ID: | 3.0.1.32.19980626133317.006bc8cc@rr.pathlink.com |
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Thread: | |
Lists: | pgsql-hackers pgsql-sql |
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(at)candle(dot)pha(dot)pa(dot)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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