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Subject: Re: how can I query for unset timestamps
From: Bret Hughes <bhughes@elevating.com>
To: "Gregory S. Williamson" <gsw@globexplorer.com>
Cc: postgresql sql list <pgsql-sql@postgresql.org>
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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
> 
> 
> 
> 
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