Re: Creating a date/time search function in Postgres.

Hi all,

I have a question about how a certain function would look. Basically, what I
want to do is having something that would take in a 'from' date (day, month,
year) and a 'to' date (also day, month and year) and then spit back a series
of records whose timestamps fall between those two dates. How would a basic
function like that look like? Would I need to have separate integers for the
day month and year, or is there a date/time object I could use instead? I am
somewhat new to Postgres, but not SQL altogether.

Thanks in advance.

"Sean O'Loughlin" <seanuww(at)gmail(dot)com> writes:

> Hi all,
> I have a question about how a certain function would look. Basically, what I want to do is
> having something that would take in a 'from' date (day, month, year) and a 'to' date (also day,
> month and year) and then spit back a series of records whose timestamps fall between those two
> dates. How would a basic function like that look like? Would I need to have separate integers
> for the day month and year, or is there a date/time object I could use instead? I am somewhat
> new to Postgres, but not SQL altogether.
> Thanks in advance.

vp=# \d categorias
Tabela "public.categorias"
Coluna | Tipo | Modificadores
-----------------+-----------------------------+---------------------------------------------------------
id | integer | not null default nextval('categorias_id_seq'::regclass)
descricao | text | not null
criado_por_id | integer |
alterado_por_id | integer |
criado_em | timestamp without time zone |
alterado_em | timestamp without time zone |
Índices:
"categorias_pkey" PRIMARY KEY, btree (id)
Restrições de chave estrangeira:
"categorias_alterado_por_id_fkey" FOREIGN KEY (alterado_por_id) REFERENCES tg_user(id)
"categorias_criado_por_id_fkey" FOREIGN KEY (criado_por_id) REFERENCES tg_user(id)

vp=# SELECT id FROM categorias WHERE alterado_em BETWEEN '2006-07-30'::DATE AND '2006-08-31'::DATE;
id
----
1
3
4
2
(4 registros)

vp=#

--
Jorge Godoy <jgodoy(at)gmail(dot)com>

Sean O'Loughlin wrote:

> I have a question about how a certain function would look. Basically, what I
> want to do is having something that would take in a 'from' date (day, month,
> year) and a 'to' date (also day, month and year) and then spit back a series
> of records whose timestamps fall between those two dates. How would a basic
> function like that look like? Would I need to have separate integers for the
> day month and year, or is there a date/time object I could use instead? I am
> somewhat new to Postgres, but not SQL altogether.

Maybe you don't really need a function. How about:

test=> SELECT '2006-08-30'::date +
generate_series(1,'2006-09-04'::date - '2006-08-30'::date);
?column?
------------
2006-08-31
2006-09-01
2006-09-02
2006-09-03
2006-09-04
(5 rows)

--
Daniel
PostgreSQL-powered mail user agent and storage: http://www.manitou-mail.org