Query in postgreSQL version Windows

"Ardian Xharra \(Boxxo\)" <axharra@xxxxxxxxxx> · Mon, 2 Jan 2006 16:01:56 -0500

Hello, there
I installed PostgreSQL on windows and when I try to 
run some queries pgadmin says an error. I know that if I change the query this 
it will work but is it possible to make this quey work in this 
way

SELECT atthasdef 
FROM pg_attribute 
WHERE 
attrelid=pg_class.oid AND pg_class.relname='client_overtime' AND 
attname='id_client_overtime'

This query works fine in PostgreSQL (Linux-Unix 
platform)

Thx
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