<h2>Answer:</h2>
Truck drivers probably can't see your vehicle if you cannot see them in their side mirror
<h2>Explanation:</h2>
In driving terminology there is a term called the bind spot. Blind spot is the area where the driver is not able to see the vehicle behind him and this area is present just behind the truck and very close to the gates of the car. Since trucks do not have the rare mirror therefore if a car is present in their blind spot they wont be able to see it. The driver behind the truck can spot it if he does not see the truck driver in the side mirror of the truck.
I think that people have lost their jobs because of an increase of computers. Also, a<span>utomobiles can crash and injure and kill people. </span><span>Ships can be sunk. </span><span>Poorly constructed or maintained machinery can harm the workers. </span><span>The telegraph put the pony express out of business. </span><span>Many factories pollute the water and air. </span>
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);
Answer is the son-father-grandfather concept. Good luck
