Re: opposite of chr(int) - Mailing list pgsql-novice

Henry,

> select
> case
> when substring('wallawa9kl',8,1) = '0' then 'true'
> when substring('wallawa9kl',8,1) = '1' then 'true'
> when substring('wallawa9kl',8,1) = '2' then 'true'
> when substring('wallawa9kl',8,1) = '3' then 'true'
> when substring('wallawa9kl',8,1) = '4' then 'true'
> when substring('wallawa9kl',8,1) = '5' then 'true'
> when substring('wallawa9kl',8,1) = '6' then 'true'
> when substring('wallawa9kl',8,1) = '7' then 'true'
> when substring('wallawa9kl',8,1) = '8' then 'true'
> when substring('wallawa9kl',8,1) = '9' then 'true'
> else 'false'
> end

> just wondering if there is something more compact or if this is an okay
> workaround solution.

How about:

CREATE OR REPLACE FUNCTION has_digit(text)
  RETURNS boolean
  LANGUAGE sql
AS $function$
select case when substring($1, '\d') is not null then true
else false
end
$function$

-- Gary Chambers