Re: how can I query for unset timestamps

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(at)elevating(dot)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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