Answers for "insert values into postgres from another table"

postgresql insert select

insert into items_ver(item_id, item_group, name)
select * from items where item_id=2;

postgres trigger insert into another table

CREATE OR REPLACE FUNCTION function_copy() RETURNS TRIGGER AS
$BODY$
BEGIN
    INSERT INTO
        table2(id,name)
        VALUES(new.id,new.name);

           RETURN new;
END;
$BODY$
language plpgsql;