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* two dates
@ 2003-02-25 06:55 mixo <mixo@beth.uniforum.org.za>
0 siblings, 2 replies; 4+ messages in thread
From: mixo @ 2003-02-25 06:55 UTC (permalink / raw)
To: pgsql-sql
I have a table which has serveral time stamps include when an entry was
'created'.
Each entry is identified by a unique 'id'. How can I best find entries
created
between two dates without going through each day between the two dates?
Currently, going through each day to get the results takes about 23
minutes for 7 days
as I have two other criteria for search: roughly I am doing about
16*17*n queries,
where n=days between two dates (for 7 days, 16*17*7 = which a number
that is
too big for my liking).
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: two dates
@ 2003-03-03 12:09 Richard Huxton <dev@archonet.com>
parent: mixo <mixo@beth.uniforum.org.za>
1 sibling, 1 reply; 4+ messages in thread
From: Richard Huxton @ 2003-03-03 12:09 UTC (permalink / raw)
To: mixo <mixo@beth.uniforum.org.za>; pgsql-sql
On Tuesday 25 Feb 2003 6:55 am, mixo wrote:
> I have a table which has serveral time stamps include when an entry was
> 'created'.
> Each entry is identified by a unique 'id'. How can I best find entries
> created
> between two dates without going through each day between the two dates?
>
> Currently, going through each day to get the results takes about 23
> minutes for 7 days
> as I have two other criteria for search: roughly I am doing about
> 16*17*n queries,
> where n=days between two dates (for 7 days, 16*17*7 = which a number
> that is
> too big for my liking).
What is wrong with SELECT id FROM foo WHERE created_date>='2003-01-01' AND
created_date<='2003-01-07' or similar? I don't see why you need multiple
queries, perhaps I have misunderstood
--
Richard Huxton
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: two dates
@ 2003-03-03 12:32 Oliver Elphick <olly@lfix.co.uk>
parent: Richard Huxton <dev@archonet.com>
0 siblings, 0 replies; 4+ messages in thread
From: Oliver Elphick @ 2003-03-03 12:32 UTC (permalink / raw)
To: Richard Huxton <dev@archonet.com>; +Cc: mixo <mixo@beth.uniforum.org.za>; pgsql-sql
On Mon, 2003-03-03 at 12:09, Richard Huxton wrote:
> What is wrong with SELECT id FROM foo WHERE created_date>='2003-01-01' AND
> created_date<='2003-01-07' or similar? I don't see why you need multiple
> queries, perhaps I have misunderstood
The BETWEEN operator is provided for this precise requirement:
SELECT id FROM foo WHERE created_date BETWEEN '2003-01-01' AND '2003-01-07';
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
========================================
"A new commandment I give to you, that you love one
another, even as I have loved you."
John 13:34
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: two dates
@ 2003-03-16 22:37 D.Sanchez <dsanchezREMOVE@bigpond.com>
parent: mixo <mixo@beth.uniforum.org.za>
1 sibling, 0 replies; 4+ messages in thread
From: D.Sanchez @ 2003-03-16 22:37 UTC (permalink / raw)
To: pgsql-sql
If you just want to select all entries created between two given dates, the
following query should do it:
SELECT column1, column2, ....
FROM table
WHERE creation_date between to_date('date1','date_format') and
to_date('date2','date_format')
order by creation_date;
This will find all the entries with a creation_date between date1 and date2
and it return the rows sorted by the creation date. You can add additional
selection critirias to the WHERE clause if needed.
David
"mixo" <mixo@beth.uniforum.org.za> wrote in message
news:3E5B1349.80705@beth.uniforum.org.za...
> I have a table which has serveral time stamps include when an entry was
> 'created'.
> Each entry is identified by a unique 'id'. How can I best find entries
> created
> between two dates without going through each day between the two dates?
>
> Currently, going through each day to get the results takes about 23
> minutes for 7 days
> as I have two other criteria for search: roughly I am doing about
> 16*17*n queries,
> where n=days between two dates (for 7 days, 16*17*7 = which a number
> that is
> too big for my liking).
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
>
> http://archives.postgresql.org
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2003-03-16 22:37 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2003-02-25 06:55 two dates mixo <mixo@beth.uniforum.org.za>
2003-03-03 12:09 ` Richard Huxton <dev@archonet.com>
2003-03-03 12:32 ` Oliver Elphick <olly@lfix.co.uk>
2003-03-16 22:37 ` D.Sanchez <dsanchezREMOVE@bigpond.com>
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