Обсуждение: Month/year between two dates

Hi to all,

I have a very simple question. Let's say that I have three records (id, date
from, date to):

1     2009-01-01     2009-08-31
2     2009-08-01     2009-08-10
3     2009-08-11     2009-08-31

Now I want to get records, "related" to a single month/year data (two
integers). For 2009/08 (int1 = 2009, int2 = 8) I should get all three
records, for 2009/05 only record 1, but for 2009/11 none of the records.

Is there any simple way to do this? A query would do :).

Thanks alot.
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Bor wrote:
> Hi to all,
>
> I have a very simple question. Let's say that I have three records (id, date
> from, date to):
>
> 1     2009-01-01     2009-08-31
> 2     2009-08-01     2009-08-10
> 3     2009-08-11     2009-08-31
>
> Now I want to get records, "related" to a single month/year data (two
> integers). For 2009/08 (int1 = 2009, int2 = 8) I should get all three
> records, for 2009/05 only record 1, but for 2009/11 none of the records.
>
> Is there any simple way to do this? A query would do :).
>
> Thanks alot.
>   
Lots of ways. The following springs to mind but I'm sure there are 
simpler ways (I'm assuming the date_from and date_to are data-type date 
and you are stuck with using int for year and month).

Use date_trunc to convert any date in a month to the first of the month 
and the following should work (untested):
...
date_trunc('month', date_from) <= (int1::text || '-' || int2::text || 
'-1')::date and
date_trunc('month', date_to) >= (int1::text || '-' || int2::text || 
'-1')::date
...

Cheers,
Steve

Dear Bor,   How you will 1 record for 2009/05 (if you use 2009/05 ) it will fetch 
all the records as it is not having month 05
am i correct?

----- Original Message ----- 
From: "Bor" <dborovnik@gmail.com>
To: <pgsql-sql@postgresql.org>
Sent: Tuesday, August 11, 2009 6:43 PM
Subject: [SQL] Month/year between two dates


>
> Hi to all,
>
> I have a very simple question. Let's say that I have three records (id, 
> date
> from, date to):
>
> 1     2009-01-01     2009-08-31
> 2     2009-08-01     2009-08-10
> 3     2009-08-11     2009-08-31
>
> Now I want to get records, "related" to a single month/year data (two
> integers). For 2009/08 (int1 = 2009, int2 = 8) I should get all three
> records, for 2009/05 only record 1, but for 2009/11 none of the records.
>
> Is there any simple way to do this? A query would do :).
>
> Thanks alot.
> -- 
> View this message in context: 
> http://www.nabble.com/Month-year-between-two-dates-tp24917400p24917400.html
> Sent from the PostgreSQL - sql mailing list archive at Nabble.com.
>
>
> -- 
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql 

I think he wanted something like:

test=# create table month_test(id serial primary key, start_date date not null, end_date date not null);
CREATE TABLE
test=# insert into month_test (start_date, end_date) values ('2009-01-01'::date, '2009-08-31'::date);
INSERT 0 1
test=# insert into month_test (start_date, end_date) values ('2009-08-01'::date, '2009-08-10'::date);
INSERT 0 1
test=# insert into month_test (start_date, end_date) values ('2009-08-11'::date, '2009-08-31'::date);
INSERT 0 1
test=# select * from month_test;
 id | start_date |  end_date 
----+------------+------------
  1 | 2009-01-01 | 2009-08-31
  2 | 2009-08-01 | 2009-08-10
  3 | 2009-08-11 | 2009-08-31
(3 rows)

test=# select * from month_test where (start_date, end_date) overlaps ('2009-05-01'::date, '2009-05-31'::date);
 id | start_date |  end_date 
----+------------+------------
  1 | 2009-01-01 | 2009-08-31
(1 row)

test=#

--
Jorge Godoy     <jgodoy@gmail.com>