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