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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:
I want to answer the 1st question. It asks, “Will we treat people unfairly for crimes they haven’t committed?” Well, of course, that’s a 100% chance. But, some people forget that people treat people unfairly for crimes they haven’t committed. Some people stay in jail for up to 35 years and are then released because they are innocent. Yes, computers will make mistakes, but the probability is much, much smaller than a human.
Explanation:
Answer:
Explanation:
HTML attributes are a modifier of an HTML element type. An attribute either modifies the default functionality of an element type or provides functionality to certain element types unable to function correctly without them. In HTML syntax, an attribute is added to an HTML start tag.
