testing for null value in integer field? - Mailing list pgsql-sql

How does one check for an unset value in an integer field?

I've tried such things as:

select ..... where intnumber = ''
select ...... where intnumber =  ?
select .....  where intnumber = NULL

Thanks.

-- 
Until later, Geoffrey    esoteric@3times25.net

Building secure systems inspite of Microsoft