Answer:
Stack.
Explanation:
Topological sort requires a bit of addition to DFS algorithm.So DFS can be done by two ways that are either you can use recursion or you can use Stack data structure to implement DFS.
Since recursion uses stack memory when it makes recursive calls and if you want to do it iteratively you can stack data structure.
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:
The answer to this question is the option "C".
Explanation:
In this question, the answer is option C. Which is river toxic pollution. This pollution is also known as Kim Kim river toxic pollution. In 2019 this pollution occurred in the water caused by unauthorized chemical garbage dumping in the river in Malaysia. The unauthorized dumping released poisonous fumes, affecting six thousand people are hospitalized in 2,775.
Answer:
The screen protector may be interfering with the touch response
Explanation:
Screen protectors or commonly called screen guards are used to protect phone screens. In case they fall to the ground, these protectors act as shields to keep the phone screen from getting damaged. However screen protectors if not positioned or fixed properly may also cause hindrance to effective touch response as they become barriers to the touch screen.
