Re: string functions and operators

Why not using text-function substring:

SELECT split_part(123.456::text,'.',1)::integer;
SELECT split_part(123.456::text,'.',2)::integer;

Regards,
Andreas

-----Ursprüngliche Nachricht-----
Von: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] Im Auftrag von Petru Ghita
Gesendet: Dienstag, 23. März 2010 04:53
An: Neil Stlyz; pgsql-sql mailing list
Betreff: Re: [SQL] string functions and operators

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For the record if you'd like to use regexp:

select substring('201.123' from $$[0-9]*$$);

and

select substring('201.1232' from $$\.([0-9]*)$$);


On 23/03/2010 4:42, Petru Ghita wrote:
>
> select 0.341*pow(10,length(0.341::text)-2);
>
> 2 is a constat that stands for the '0.' part of the string
> representing the decimal part of the number.
>
>
> Petru Ghita
>
> On 23/03/2010 3:16, Neil Stlyz wrote:
>> This is good, however, I need
> only the numbers to the right of the
>
>> decimal point....
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>
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>> so if my number if 17.2
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>> I would need one query that would return 17   (your function
> will
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>> do that)
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>> and the second query would return:   2
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>> not 0.2
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>> just 2
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>> Does that make sense?
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> ----------------------------------------------------------------------
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*From:* Petru Ghita <petrutz@venaver.info>
>> *To:* Neil Stlyz
> <neilstylz@yahoo.com>; pgsql-sql mailing list
>
>> <pgsql-sql@postgresql.org> *Sent:* Mon, March 22, 2010
> 8:08:30 PM
>
>> *Subject:* Re: [SQL] string functions and operators
>
>
>
>> For numeric data types use:
>
>
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>> http://www.postgresql.org/docs/8.4/static/functions-math.html
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>> You could then use|floor|(dp or numeric)|| for example:
>
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>> postgres=# select floor(71.912); floor ------- 71 (1 row)
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>> postgres=# select 71.912-floor(71.912); ?column? ----------
>> 0.912
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>> But as you might have negative numbers in there I guess you
> should
>
>> abs() the values like in:
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>
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>> postgres=# select abs(71.912)-floor(abs(71.912)); ?column?
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>> ---------- 0.912
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>> postgres=# select abs(-171.912)-floor(abs(-171.912)); ?column?
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>> ---------- 0.912 (1 row)
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>> On 23/03/2010 2:50, Petru Ghita wrote:
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>>> That field of yours... what type is it? Is it TEXT? is it a
>
>>> numeric type? If it's TEXT, why don't you make it say...
>
>>> NUMERIC(/10/, /6///)?
>
>
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>>>
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> http://www.postgresql.org/docs/8.4/interactive/datatype-numeric.html#DATATYPE-NUMERIC-DECIMAL
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On 23/03/2010 2:20, Neil Stlyz wrote:
>>>> Hello,
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>>>> I have a dilema and I was hoping someone here may offer
>
>>>> guidance
>
>
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>>>> or assistance. I bet this is a very simple question for
>
>> someone
>
>
>
>>>> out there but I am having problems coming up with a
> solution.
>
>>> Here
>
>
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>>>> it is...
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>>>> suppose I have a field with the following values:
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>>>> 77.1 77.2 134.1 134.2 134.3 5.1 5.2
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>>>> I need two seperate SELECT queries. One would return the
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>>> following
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>>>> values (everything left of the decimal point)
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>>>> 77 77 134 134 5 5
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>>>> The second query would return all of the values to the
> right
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>>>> of
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>>>> the decimal point:
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>>>> 1 2 1 2 3 1 2
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>>>> Now, I have been using the following information
> (although
>
>>>> very
>
>
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>>>> Greek) to try to solve this problem:
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> http://www.postgresql.org/docs/current/static/functions-string.html
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And I have been playing around with the syntax of the following:
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>>>> substring('112.5' from '%#"___.#"_' for '#')
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>>>> but the aforementioned is not quite working out... can
> someone
>
>
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>>>> please show me a string function that will produce the
> desired
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>>>> results?
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>>>> Thanks! ~n
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