finding records not listed in a column, Postgresql

Hi,

I need the records in table A in which the values in
A.objectID are not listed in B.objectID.  I'm such a
noob that I'm not sure of the terms I need to use for
this statement.

table A
rows: person_id, objectID

table B
rows: id, objectID

thanks,
Aaron

=====
thanks,
Aaron
www.aaronpayne.com

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