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Thread: missing something obvious about intervals?

missing something obvious about intervals?

From
David Rysdam
Date:
I have a table that has a date field and a "real" field that represents
a number of seconds.  I want select the date field + the seconds field.
Just adding it doesn't work.  Casting to interval doesn't work.
to_date/to_timestamp don't work.  How do I do this?

Re: missing something obvious about intervals?

From
"Jim Buttafuoco"
Date:
try


select '2005-12-01'::date + (456.5::float || ' seconds')::interval;
        ?column?
------------------------
 2005-12-01 00:07:36.50
(1 row)


---------- Original Message -----------
From: David Rysdam <drysdam@ll.mit.edu>
To: "pg >> Postgres General" <pgsql-general@postgresql.org>
Sent: Mon, 12 Dec 2005 13:00:13 -0500
Subject: [GENERAL] missing something obvious about intervals?

> I have a table that has a date field and a "real" field that represents
> a number of seconds.  I want select the date field + the seconds field.
> Just adding it doesn't work.  Casting to interval doesn't work.
> to_date/to_timestamp don't work.  How do I do this?
>
> ---------------------------(end of broadcast)---------------------------
> TIP 3: Have you checked our extensive FAQ?
>
>                http://www.postgresql.org/docs/faq
------- End of Original Message -------

Re: missing something obvious about intervals?

From
David Rysdam
Date:
I knew it had to be something like this, but the search space was just
too big.  Thanks!

Jim Buttafuoco wrote:

>try
>
>
>select '2005-12-01'::date + (456.5::float || ' seconds')::interval;
>        ?column?
>------------------------
> 2005-12-01 00:07:36.50
>(1 row)
>
>
>---------- Original Message -----------
>From: David Rysdam <drysdam@ll.mit.edu>
>To: "pg >> Postgres General" <pgsql-general@postgresql.org>
>Sent: Mon, 12 Dec 2005 13:00:13 -0500
>Subject: [GENERAL] missing something obvious about intervals?
>
>
>
>>I have a table that has a date field and a "real" field that represents
>>a number of seconds.  I want select the date field + the seconds field.
>>Just adding it doesn't work.  Casting to interval doesn't work.
>>to_date/to_timestamp don't work.  How do I do this?
>>
>>---------------------------(end of broadcast)---------------------------
>>TIP 3: Have you checked our extensive FAQ?
>>
>>               http://www.postgresql.org/docs/faq
>>
>>
>------- End of Original Message -------
>
>
>
>

Re: missing something obvious about intervals?

From
Volkan YAZICI
Date:
On Dec 12 01:00, David Rysdam wrote:
> I have a table that has a date field and a "real" field that represents
> a number of seconds.  I want select the date field + the seconds field.
> Just adding it doesn't work. Casting to interval doesn't work.
> to_date/to_timestamp don't work. How do I do this?

In the "9.9. Date/Time Functions and Operators" chapter of PostgreSQL
Documentation, here's the first example of the first page:

Operator: +
Example : date '2001-09-28' + integer '7'
Result  : date '2001-10-05'


--
"We are the middle children of history, raised by television to believe
that someday we'll be millionaires and movie stars and rock stars, but
we won't. And we're just learning this fact," Tyler said. "So don't
fuck with us."

Re: missing something obvious about intervals?

From
Volkan YAZICI
Date:
On Dec 12 08:09, Volkan YAZICI wrote:
> On Dec 12 01:00, David Rysdam wrote:
> > I have a table that has a date field and a "real" field that represents
> > a number of seconds.  I want select the date field + the seconds field.
> > Just adding it doesn't work. Casting to interval doesn't work.
> > to_date/to_timestamp don't work. How do I do this?
>
> In the "9.9. Date/Time Functions and Operators" chapter of PostgreSQL
> Documentation, here's the first example of the first page:
>
> Operator: +
> Example : date '2001-09-28' + integer '7'
> Result  : date '2001-10-05'

Sorry, just after typing send key I realized that I misunderstood your
question. Here is a working one:

test=> SELECT d + (i || ' seconds')::interval FROM t;


Regards.

--
"We are the middle children of history, raised by television to believe
that someday we'll be millionaires and movie stars and rock stars, but
we won't. And we're just learning this fact," Tyler said. "So don't
fuck with us."

Re: missing something obvious about intervals?

From
Bruno Wolff III
Date:
On Mon, Dec 12, 2005 at 13:04:05 -0500,
  Jim Buttafuoco <jim@contactbda.com> wrote:
>
> try
>
>
> select '2005-12-01'::date + (456.5::float || ' seconds')::interval;
>         ?column?
> ------------------------
>  2005-12-01 00:07:36.50
> (1 row)

You are better off doing a multiply. Something like:
area=> select '2005-12-01'::date + 456.5 * '1 second'::interval;
        ?column?
------------------------
 2005-12-01 00:07:36.50
(1 row)