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:
Be polite and open to ideas
Explanation:
Before going make a list of things you need to know for sure. You could also provide some samples. Make sure you take many notes on what they want! Speak with your client and ask them how and when they want to be updated on progress, some might want to know once a week others may want to receive a progress report every day. Communication is always key and will always help you provide good service.
Hopefully, this helps!
Answer:
Yes, it is.
Explanation:
Yes it will surely achieve the goal. When there is no license for user, then he/she will not access the dashboard.
<span>Go paperless.
Use natural lighting.
Grow trees nearby.
Reduce, reuse, and recycle.
Carpool.
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