Re: function DECODE and triggers

I'm migrating from oracle to postgresl, and i  have these 2 problems:

1.
PostgreSQL doesn't support function DECODE from Oracle, but it can be
replicated with
CASE WHEN expr THEN expr [...] ELSE expr END  , the problem appears when i
want to convert this sentence from oracle to postgresl:
               select decode (pre.C_GEN,'01','M','02','F','') as GENERO
my convertion is
              case when  pre.C_GEN = '01' then GENERO='M' else GENERO='F'
end ,
but i dont' know if the assigment of GENERO is correct.

2.
Writing triggers i don't know if postgresql supports statements like this:
    CREATE OR REPLACE TRIGGER trig
    AFTER UPDATE OF column2              <<----- Here is the doubt
    ON table_product
    FOR EACH ROW
    BEGIN
    ...
    END

In postgresql:
   CREATE OR REPLACE TRIGGER trig
   AFTER UPDATE OF column2               <<----- is this correct?
   ON table_product
   FOR EACH ROW EXECUTE PROCEDURE trig();

Thanks for your answers..
Rafael

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