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: To adjust the spacing between characters that make up a word
Explanation: Kerning refers to the way spacing between two specific characters is adjusted. The idea is to give a better looking result by reducing the spacing between characters that fit together nicely (such as "A" and "V") and increasing the spacing between characters that don't. Select the text that you want to change.
Answer:
C, Or D.
Explanation:
<em>Because A speed enhancing hard drive Can store any type of quick file if you just click on it will load fast. Same thing goes for a hard drive but you have to transfer the file</em>
Answer:B) Archives/backups
Explanation: Archive is the group of records of data that are saved for the future use.These are the historic data that is not currently used in the actual location .
Backup is the the the copy of the group of data that is not in the original form to be used in future. Thus the correct option is option(B).
Updating of the plans by the technician cannot be done through other given options because they don't hold the historic records of the data for the renewing of the plans.
The tab that you would use is review
