From: | "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | "Carlos Quintero" <carlos(dot)quintero(dot)sspa(at)juntadeandalucia(dot)es> |
Cc: | pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #3435: problem with substring function |
Date: | 2007-07-10 10:32:09 |
Message-ID: | 162867790707100332l549abb1bkb18a52987586352a@mail.gmail.com |
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Thread: | |
Lists: | pgsql-bugs |
Hello
It has little bit strange behave on 8.3. It works well, but I have to
use casting.
postgres=# select substring('1234' from to_number('3', '999999') for 3);
ERROR: function pg_catalog.substring(unknown, numeric, integer) does not exist
LINE 1: select substring('1234' from to_number('3', '999999') for 3)...
^
HINT: No function matches the given name and argument types. You
might need to add explicit type casts.
postgres=# select substring('1234' from to_number('3', '999999')::int for 3);
substring
-----------
34
(1 row)
Regards
Pavel Stehule
2007/7/10, Carlos Quintero <carlos(dot)quintero(dot)sspa(at)juntadeandalucia(dot)es>:
>
> The following bug has been logged online:
>
> Bug reference: 3435
> Logged by: Carlos Quintero
> Email address: carlos(dot)quintero(dot)sspa(at)juntadeandalucia(dot)es
> PostgreSQL version: 8.2.4
> Operating system: Linux RedHat Enterprise 3
> Description: problem with substring function
> Details:
>
> Hi,
>
> I like to use a numerical expression as parameter for the substring
> function, but it works always as i use regular expressions. Please, try
> this:
>
> select substring('1234' from to_number('3', '999999') for 3);
>
> What returns a empty string:
>
> substring
> -----------
>
> (1 fila)
>
> But the right result must be this:
>
> select substring('1234' from 3 for 3);
>
> substring
> -----------
> 34
> (1 fila)
>
> If i use other numbers, i got even some errors:
>
> select substring('1234' from to_number('33', '999999') for 3);
>
> ERROR: la expresión regular no es válida: invalid backreference number
> CONTEXTO: función SQL «substring» en la sentencia 1
>
> This is a sample, really i like to use an expression using date_part() as
> the first parameter for substring.
>
>
> Best Regards,
> Carlos
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
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