Suggestion for Date/Time Functions Section

Hi,

I suggestion for the date/time functions in the docs:
http://www.postgresql.org/docs/8.0/interactive/functions-datetime.html

I was trying to figure out how to do:
update table set next=now() + interval 'table.period
seconds';

I tried subqueries, the concat operator, and anything
else I could think of until I rediscovered the page on
the various ways to cast. Perhaps mix up the examples
in the docs so other ways to do date arithmetic (and
that allow expressions, fields, etc.) are obvious:

date '2001-09-28' + cast((7+7)||' seconds' as
interval);
date '2001-09-28' + ((7+7)||' seconds')::interval);
etc.

Or am I missing an easier way to do date arithmetic
using a table's fields as part of the equation? (I
think mysql has date_add(...), date_subtract(...),
etc.

CSN

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