For the view of Exercise 4.18, explain why the database system would not allow a tuple to be inserted into the database through this view.
For reference
For the database of Figure 4.12, write a query to find the ID of each employee with no manager. Note that an employee may simply have no manager listed or may have a null manager. Write your query using an outer join and then write it again using no outer join at all.
OUTER JOIN
select e.ID from employee e left outer join manages m on e.ID = m.ID
where m.manager_id is null;
NO OUTER
select e.ID from employee e where e.ID not in (select m.ID from manages m) or e.ID in (select m.ID from manages m where m.manager_id is null);
The network of satellites
monitoring continental movement is referred to as GPS. The answer is letter A.
GPS or Global Positioning System revolves the earth twice a day in a precise
orbit and transmit information signal back to earth. It uses trilateration to
calculate the user’s location.
The answer is: Lower overall taxes
Answer:
Correct Answer is (d) Information sensitivity policy
Explanation:
Information sensitivity policy establishes the criteria for classifying and securing the organization's information in a manner that is appropriate to its level of security.
However, other options are incorrect. Server security can be established only on servers and on information/data that is in the server from unauthorized access. While VPN security is used for protecting network and encryption is used to encrypt data from illegal access.
However, only information sensitivity policy is used for classifying and securing organization information to the outside world.
The intention of information sensitivity policy:
The intention of using any information sensitivity policy is to help the employee to determine what information can be disclosed to non-employee, as well as the relative sensitivity of the information that should not be disclosed outside of the company without proper permission or authorization from supreme leadership of an organization.