data type change

Hallo to all from Italy,
does anybody know if any sql instruction exists to allow
change of a column data type? In my case I need to convert a
money type into numeric without any success. Second
nuissance: I am using the italian translation of PostgreSQL
manual, author o Relly, the one with the big elephant in
cover, this is a very good book but I am spending a good
amount of time to re-create the example-database used:
'booktown', does anybody know if it is possible to get it
somewhwere in the net?
Thank ypu andregard

-- 
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renzo rizzato
rovigo - italy
linux mandrake 8.2
linux user #272783
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