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:
A. The function definition must appear before the function is called
Explanation:
Given
The above lines of code
Required
Determine the error in the program
In python, functions has be defined before they are called but in this case (of the given program), the function is called before it was defined and this will definitely result in an error;
<em>Hence, option A answers the question</em>
The correct sequence of the program is as follows:
<em>def evenOdd(n):
</em>
<em> if n % 2 == 0:
</em>
<em> return "even"
</em>
<em> return "odd"
</em>
<em>num = int(input("Enter an integer: "))
</em>
<em>print("The integer is", evenOdd(num))
</em>
<em />
Answer:
The description including its query is provided throughout the section of the elaboration elsewhere here.
Explanation:
- Coordination between teams is the main challenge that this new strategy can make. Agile creation is focused on the teamwork of cross-functional teams, where every other mission is identified and distinct teams are formed. All the departments collaborate and afterward work in stages until the completion of this research project.
- Unless the organization shuts several departments, contact with various teams and peers will be disrupted and contact differences with workers as well as the team would be established.
- The best approach will be to provide regular communication calls with multiple project managers such that each project stage is synchronized. In turn, this same project coordinator should always have numerous calls with his group members to even get construction progress.
