CREATE TABLE ts (
	dep		text,
	descr		text
);

INSERT INTO ts VALUES ('A','aaaaaa');
INSERT INTO ts VALUES ('B','bbbbbb');
INSERT INTO ts VALUES ('B','xxxxxx');
INSERT INTO ts VALUES ('A','yyyyyy');

create view va as select * from ts where dep='A';
create view vb as select * from ts where dep='B';

revoke all on ts from psergio;
revoke all on va from psergio;
revoke all on vb from psergio;

grant select on va to psergio;

select * from va;
-- Denied because ts is not acessible!!!

select * from vb;

drop table ts;
drop view va;
drop view vb;