Re: CHAR to INT

Hello

2008/7/12 Martín Marqués <martin.marques@gmail.com>:
> I'm trying to make a PL function to pass from an alphanumeric string
> to a numeric one changing the chars in the string to it's ORD (the
> inverse of the chr function) and I'm stumbling with two problems:
>
> 1) How to know if the CHAR is numeric or not.
> 2) If it's not numeric I want to get it's ord, but I can't find
> something like that in PG.
>
postgres=# select '1' between '0' and '9';?column?
----------t
(1 row)

postgres=# select 'a' between '0' and '9';?column?
----------f
(1 row)

postgres=# select ascii('7') - ascii('0');?column?
----------       7
(1 row)


Regards
Pavel Stehule

> Any ideas?
>
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> Martín Marqués
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