tree-structured query

in a simple tree structured table<br /><br />table t(<br />  id primary key,<br />  pnt_id references t( id ),<br /> 
name<br/>);<br /><br />does anyone know an easy howbeit sneaky way of determining ancestory and decendency without
recursivefunctions,<br /><br />select name from t where exists <ancestor or descendent><br /><br />thanks for
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