RULES - Mailing list pgsql-sql

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I need something like this .....

CREATE RULE piezas_add ASON insert TO piezasDO update materia_prima set usadas=(usadas+1)where
n_material=new.n_material;

CREATE RULE piezas_delete ASON delete TO piezasDO update materia_prima set usadas=(usadas-1)where
n_material=old.n_material;

Inserting all is OK.
... but in deleting operations nothing changes.

Can someone help me ??

And .... i would like to do the same when updating ....

Can i do something like this ?? 
What is the rigth syntax ??
Must i create 2 rules to perform the action ???

CREATE RULE piezas_update ASON update TO piezas.n_materialDO            update materia_prima set usadas=(usadas-1)
where          n_material=old.n_material           ???WHAAAT???           update materia_prima set usadas=(usadas+1)
where          n_material=new.n_material                    
 
thanks !!!

fer

- -- 
Fernando Moyano

Frase del día:
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El que retiene algo que no necesita es igual a un ladrón. (M Gandhi)

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