Re: how can I query for unset timestamps

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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