Обсуждение: TODAY and CURRENT?

I have a table with columns

datetime   timestamp,
value        float(8)

I want to delete rows 10 days older or 10 hours older by

delete from tablename where datetime < TODAY-10;
or
delete from tablename where datetime between CURRENT-10 and CURRENT;

So are there key words TODAY, CURRENT in PostgreSQL?

Thank you!

Hi Raymond,

You might try something like this:

DELETE FROM tablename WHERE datetime < ('now'::timestamp - '10
days'::interval);
and
DELETE FROM tablename WHERE datetime BETWEEN ('now'::timestamp - '10
hours'::interval) AND 'now'::timestamp;

If you just want the date stamp, you can use 'now'::date instead of your
TODAY.
If you want date-and-time stamp, use 'now'::timestamp - this would match
your idea of CURRENT.

Hope this helps

Francis Solomon

>
> I have a table with columns
>
> datetime   timestamp,
> value        float(8)
>
> I want to delete rows 10 days older or 10 hours older by
>
> delete from tablename where datetime < TODAY-10;
> or
> delete from tablename where datetime between CURRENT-10 and CURRENT;
>
> So are there key words TODAY, CURRENT in PostgreSQL?
>
> Thank you!
>

On Tue, Dec 19, 2000 at 10:37:42AM -0500, Raymond Chui wrote:
> delete from tablename where datetime < TODAY-10;

delete from tablename where datetime < timestamp 'now' - interval '10 days';

or

delete from tablename where age(datetime) > '10 days';
--
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Hey Guys,

This is probably a trivial question to most but I can't figure it out.  I am
doing a previous button and I need to select the record that has a lower
comment id than the current one.  The problem is I cant use commentid-1
becuase the commentid's are not incremented by one each time but by
different numbers.  I also cant use the following:

$sql = "select threadid, commentid, name, detail from comments where
commentid < '$commentid' and threadid='$threadid'";


 because it gets the lowest value comment whereas what I want is the highest
value comment but lower that $commentid (so basically the one immediately
below this one).

Any help would be appreciated,
Thanks,
Abe