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:[EMAIL PROTECTED] 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
