CREATE OR REPLACE TRIGGER trigger_a BEFORE INSERT ON A FOR EACH ROW begin insert into b values(:new.a,'2'); end;
CREATE OR REPLACE TRIGGER "A" BEFORE update or INSERT ON "A"."A" FOR EACH ROW begin if inserting then insert into b values(:new.a,'2'); else ... end if; end;
INSERT ON A FOR EACH ROW
begin
insert into b values(:new.a,'2');
end;
BEFORE update or INSERT ON "A"."A"
FOR EACH ROW
begin
if inserting then
insert into b values(:new.a,'2');
else
...
end if;
end;