Re: Function testing if a string is a number ?

Arnaud Lesauvage  writes:
> I am searching for a function that would return true if a string 
> is a number.
> In Access I would have written IsNumeric('mystring'), but this 
> function does not exist in postgres.

Write your own using a pattern test, for instance
	varchar ~ '^[0-9]+$'
See
http://www.postgresql.org/docs/8.1/static/functions-matching.html

			regards, tom lane