Обсуждение: range type expression syntax

Seems I'm missing a trick trying to get rangetypes working:

No problem building the string:
select concat('''[', now()::date, ',', now()::date, ']''') testrange;
           testrange
---------------------------
  '[2015-02-26,2015-02-26]'
(1 row)

Bombed-out trying to turn this into a daterange:
postgres=# select concat('''[', now()::date, ',', now()::date,
']''')::daterange testrange;
ERROR:  malformed range literal: "'[2015-02-26,2015-02-26]'"
DETAIL:  Missing left parenthesis or bracket.

Is there a specific casting I need to apply in order to render a literal
daterange from parameterized range elements?

/john

On Thu, 26 Feb 2015 15:11:28 -0500, John Turner <jjturner@energi.com>
wrote:

> Seems I'm missing a trick trying to get rangetypes working:
>
> No problem building the string:
> select concat('''[', now()::date, ',', now()::date, ']''') testrange;
>            testrange
> ---------------------------
>   '[2015-02-26,2015-02-26]'
> (1 row)
>
> Bombed-out trying to turn this into a daterange:
> postgres=# select concat('''[', now()::date, ',', now()::date,
> ']''')::daterange testrange;
> ERROR:  malformed range literal: "'[2015-02-26,2015-02-26]'"
> DETAIL:  Missing left parenthesis or bracket.
>
> Is there a specific casting I need to apply in order to render a literal
> daterange from parameterized range elements?
>
> /john
>
>
Sorry - too quick to post, I realize there was no need to wrap the
expression in extra quotes:

postgres=# select concat('[', now()::date, ',', now()::date,
']')::daterange testrange;
         testrange
-------------------------
  [2015-02-26,2015-02-27)
(1 row)

> postgres=# select concat('[', now()::date, ',', now()::date,
> ']')::daterange testrange;

There are range specific functions for this:
select daterange(now()::date, now()::date, '[]')

regards,
Marc Mamin



________________________________________
Von: pgsql-general-owner@postgresql.org [pgsql-general-owner@postgresql.org]" im Auftrag von "John Turner
[jjturner@energi.com]
Gesendet: Donnerstag, 26. Februar 2015 21:17
An: pgsql-general@postgresql.org
Betreff: Re: [GENERAL] range type expression syntax

On Thu, 26 Feb 2015 15:11:28 -0500, John Turner <jjturner@energi.com>
wrote:

> Seems I'm missing a trick trying to get rangetypes working:
>
> No problem building the string:
> select concat('''[', now()::date, ',', now()::date, ']''') testrange;
>            testrange
> ---------------------------
>   '[2015-02-26,2015-02-26]'
> (1 row)
>
> Bombed-out trying to turn this into a daterange:
> postgres=# select concat('''[', now()::date, ',', now()::date,
> ']''')::daterange testrange;
> ERROR:  malformed range literal: "'[2015-02-26,2015-02-26]'"
> DETAIL:  Missing left parenthesis or bracket.
>
> Is there a specific casting I need to apply in order to render a literal
> daterange from parameterized range elements?
>
> /john
>
>
Sorry - too quick to post, I realize there was no need to wrap the
expression in extra quotes:

postgres=# select concat('[', now()::date, ',', now()::date,
']')::daterange testrange;
         testrange
-------------------------
  [2015-02-26,2015-02-27)
(1 row)


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On Fri, 27 Feb 2015 02:57:15 -0500, Marc Mamin <M.Mamin@intershop.de>
wrote:

>> postgres=# select concat('[', now()::date, ',', now()::date,
>> ']')::daterange testrange;
>
> There are range specific functions for this:
> select daterange(now()::date, now()::date, '[]')
>
> regards,
> Marc Mamin
>

Marc, thanks - indeed it's right there in 8.17.6!  As you might suspect,
I'm rushing through things more than I'd care to, so I'm grateful for this
list and the dose of sanity it provides :)

Cheers,
John

_______________________________________
> Von: pgsql-general-owner@postgresql.org
> [pgsql-general-owner@postgresql.org]" im Auftrag von "John
> Turner [jjturner@energi.com]
> Gesendet: Donnerstag, 26. Februar 2015 21:17
> An: pgsql-general@postgresql.org
> Betreff: Re: [GENERAL] range type expression syntax
>
> On Thu, 26 Feb 2015 15:11:28 -0500, John Turner <jjturner@energi.com>
> wrote:
>
>> Seems I'm missing a trick trying to get rangetypes working:
>>
>> No problem building the string:
>> select concat('''[', now()::date, ',', now()::date, ']''') testrange;
>>            testrange
>> ---------------------------
>>   '[2015-02-26,2015-02-26]'
>> (1 row)
>>
>> Bombed-out trying to turn this into a daterange:
>> postgres=# select concat('''[', now()::date, ',', now()::date,
>> ']''')::daterange testrange;
>> ERROR:  malformed range literal: "'[2015-02-26,2015-02-26]'"
>> DETAIL:  Missing left parenthesis or bracket.
>>
>> Is there a specific casting I need to apply in order to render a literal
>> daterange from parameterized range elements?
>>
>> /john
>>
>>
> Sorry - too quick to post, I realize there was no need to wrap the
> expression in extra quotes:
>
> postgres=# select concat('[', now()::date, ',', now()::date,
> ']')::daterange testrange;
>          testrange
> -------------------------
>   [2015-02-26,2015-02-27)
> (1 row)