Question about function

Hello list.
That might sound very lame but I am new to postgres.
I was looking into the postgres guide and trying to make a function to make an insert to a table.
but postgres returns me an error in the RETURN of the function

query is:
CREATE FUNCTION test() RETURNS bool AS 'INSERT INTO b (nome) VALUES (\'PQP\');' LANGUAGE 'sql';
>> function declared to return type bool, but final query is not a retrieve

obviously my return type is incorrect... so what should I use?

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