Re: subtract a day from the NOW function

--- "Campbell, Lance" <lance(at)uiuc(dot)edu> escreveu:

> 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().
>

Try:
SELECT some_timestamp
WHERE some_timestamp > 'yesterday'::timestamp;

Look 8.5.1.5. Special Values at:
http://www.postgresql.org/docs/8.2/interactive/datatype-datetime.html

[]s
Osvaldo

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