[postgis-users] Postgis clipping

[francescoboccacci at libero.it]

Hi to all,
i have a question for you. I have a huge table in postgis where i stored 
polygon features ( GEOMETRY type). I can load the features in Qgis and for this 
reason i'd like to search if possible a postigis function that can make clip 
(or hole) in my a features.
Pratically I ask to you if there is a possibility to make a clip in a polygon 
features and how it's works. Please can you send me an example?

Thank to all

Francesco