Re: string functions and operators

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