From: Bret Hughes <bhughes@elevating.com>
To: Gregory S. Williamson <gsw@globexplorer.com>
Cc: postgresql sql list <pgsql-sql@postgresql.org>
Subject: Re: how can I query for unset timestamps
Date: 22 Feb 2005 16:05:16 -0600
Message-ID: <1109109916.3872.125.camel@bretsony> (raw)
In-Reply-To: <71E37EF6B7DCC1499CEA0316A256832801D4BE98@loki.wc.globexplorer.net>
References: <71E37EF6B7DCC1499CEA0316A256832801D4BE98@loki.wc.globexplorer.net>
Well, thank you very much. works perfectly, I guess I have not done
much NULL value stuff.
Bret
On Tue, 2005-02-22 at 15:19, Gregory S. Williamson wrote:
> Bret --
> A test for NULL uses the IS statement, e.g.:
>
> SELECT * FROM tablefoo WHERE last_timestamp IS NULL;
>
> HTH,
>
> Greg Williamson
> DBA
> GlobeXPlorer LLC
>
> -----Original Message-----
> From: Bret Hughes [mailto:bhughes@elevating.com]
> Sent: Tue 2/22/2005 1:09 PM
> To: postgresql sql list
> Cc:
> Subject: [SQL] how can I query for unset timestamps
> I have a table that I recently altered by adding several timestamp
> columns. I would like to query the table for those rows for which the
> timestamp has not been set but am unable to find a way to do so. any
> tips ? in psql the column appears empty and char_length returns
> nothing.
>
> Some of what I have tried
>
> "" -> not valid
>
> char_length(last_timestamp) > 0 -> returns the rows with the time
> stamps
>
> where NOT char_length(last_timestamp) > 0 -> returns 0 rows
>
> where NOT (char_length(last_timestamp) > 0 ) -> returns 0 rows
>
> where last_timestamp = NULL; -> 0 rows
>
> this is kicking my butt, and starting to piss me off so if any one has
> tips I would appreciate it.
>
> Bret
>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Don't 'kill -9' the postmaster
>
> !DSPAM:421b9fba271461201672223!
>
>
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: bhughes@elevating.com, gsw@globexplorer.com
Subject: Re: how can I query for unset timestamps
In-Reply-To: <1109109916.3872.125.camel@bretsony>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox