Hey, there,
This is very interesting.
I have similar problem:
I want drop some junky table in my database, how can I detect a table when last
time it is used.
I try to say that I want to know how long this table has NOT been used at all.
I don't which system table holds this statistics.
Josh Berkus wrote:
> Brian, Jean-Christophe,
>
> >Someone corrects me if I'm wrong, I come from the Oracle world...
> >
> > Dates (or I should say TimeStamps) are stored as floating point values
> > : the integer part is the number of days since a certain date
> > (epoch or 01/01/1970 on unix-based databases) and the fractionnal part is the
> > portion of the day (although I don't know --yet-- how to convert
> > date2-date1 to an integer, trunc does not work).
>
> You're doing this the hard way. One of Postgres' best features is its
> rich collection of date-manipulation functions. Please see:
>
> ... Hmmmm. The online docs appear to be down. When they're back up,
> please check the sections on: Date/Time data types, and Date/Time
> manipulation functions.
>
> -Josh Berkus
>
> P.S. Brian, a general tutorial on writing SQL, such as O'Reilly's
> soon-to-be released SQL book, might help you a great deal.
>
> --
> ______AGLIO DATABASE SOLUTIONS___________________________
> Josh Berkus
> Complete information technology josh@agliodbs.com
> and data management solutions (415) 436-9166
> for law firms, small businesses fax 436-0137
> and non-profit organizations. pager 338-4078
> San Francisco
--
Jie LIANG
Internet Products Inc.
10350 Science Center Drive
Suite 100, San Diego, CA 92121
Office:(858)320-4873
jliang@ipinc.com
www.ipinc.com