From: Bruce Momjian <maillist@candle.pha.pa.us>
To: kachun@pathlink.com
Cc: hackers@postgreSQL.org
Subject: Re: [SQL] isnull function]
Date: Fri, 26 Jun 1998 22:11:56 -0400 (EDT)
Message-ID: <199806270211.WAA17393@candle.pha.pa.us> (raw)
In-Reply-To: <3.0.1.32.19980626133317.006bc8cc@rr.pathlink.com>
>
> 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?
>
>
Having DateTime* be a NULL does not represent a NULL value in SQL
internally.
Not sure how to do it, because I don't rememeber where the NULL checking
is done.
--
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)
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To: pgsql-sql@postgresql.org
Cc: maillist@candle.pha.pa.us, kachun@pathlink.com, hackers@postgreSQL.org
Subject: Re: [SQL] isnull function]
In-Reply-To: <199806270211.WAA17393@candle.pha.pa.us>
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