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.

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