ISNUMERIC Function in Vertica?

There isn't a built in function like ISNUMERIC, but we can create it.

dbadmin=> create function isnumeric(x varchar) return varchar
dbadmin-> as
dbadmin-> begin
dbadmin->   return REGEXP_COUNT(x, '^[0-9.-]+$');
dbadmin->
dbadmin-> end;
CREATE FUNCTION
dbadmin=> select col1, isnumeric(col1) isnumeric from test;
 col1 | isnumeric
------+-----------
 100  | 1
 25.5 | 1
 A    | 0
 25A  | 0
 -60  | 1
(5 rows)