subtract a day from the NOW function

Table

Field "some_timestamp" is a timestamp.

In a "WHERE" statement I need to compare a timestamp field in a table
"some_timestamp" to now() - one day.

Example:

SELECT some_timestamp WHERE to_char(some_timestamp, 'YYYYMMDD') >
(to_char(now(), 'YYYYMMDD') - 1 day);

The statement "to_char(now(), 'YYYYMMDD') - 1 day)" is obviously
incorrect. I just need to know how to form this in a way that will
work.

If there is an entirely different solution I am all for it. Do note
that I started down this path because I want to exclude the hour,
minutes and seconds found in the field "some_timestamp" and in the
function now().

Thanks,

Lance Campbell

Project Manager/Software Architect

Web Services at Public Affairs

University of Illinois

217.333.0382

http://webservices.uiuc.edu