default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP

with mysql you can do:

CREATE TABLE [table]
...
stamp timestamp NOT NULL default CURRENT_TIMESTAMP on
update CURRENT_TIMESTAMP,
...

but with pgsql it seems you need to do a trigger:

CREATE RULE [rule] AS ON UPDATE TO [table] DO UPDATE
[table] SET stamp = CURRENT_TIMESTAMP \g

which give you:

ERROR: infinite recursion detected in rules for
relation [table]

what's the trick???

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