> CREATE TABLE orders (
  id int,
  product text,
  number int,
  employee text
);
> ALTER TABLE orders ENABLE ROW LEVEL SECURITY;
> CREATE POLICY p1 ON orders FOR ALL TO PUBLIC
  USING (employee = current_user);
> GRANT ALL ON TABLE orders TO PUBLIC;
> SET SESSION AUTHORIZATION m1;
> INSERT INTO orders VALUES (1, 'Screw', 10, 'm1');
> INSERT INTO orders VALUES (2, 'Nail', 5, 'm2');  -- <Error: not allowed>
> SET SESSION AUTHORIZATION m2;
> INSERT INTO orders VALUES (3, 'Hammer', 1, current_user);
> SET SESSION AUTHORIZATION m1;
> SELECT * FROM orders;

[...]

> SET SESSION AUTHORIZATION postgres;
> SELECT * FROM orders;

[...]