global object-id

[Konrad Kieling]

hi,
is there a simple way (ie without creating and deleting datasets in an 
extra table) to use an auto_increment id field in several tables. no 
table has to have all ids, so i cannot use the field of a master table 
in childs. it seems one can use a sequence in postgresql in different 
tables. is it possible in a similar way?

ciao,
   konrad