Suppose that A1 wants to allow A3 to retrieve information from either of the two tables and also to be able to propagate the SELECT privilege to other accounts.
A1 can issue the command:
GRANT SELECT ON EMPLOYEE, DEPARTMENT
TO A3 WITH GRANT OPTION;
A3 can grant the SELECT privilege on the EMPLOYEE relation to A4 by issuing:
GRANT SELECT ON EMPLOYEE TO A4;
Notice that A4 can’t propagate the SELECT privilege because GRANT OPTION was not given to A4