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);
Well knowing how the government is with security id go with A. as it makes a lot of sense unlike B and D and if they were looking for software the question would mention it
Novice drivers lack the experience necessary to reliably categorize and appropriately respond to roadside hazards. A roadside hazard refers to any roadside objects or features that have a diameter greater than 100mm that is on or near the roadway. These are objects or features that are likely to create a dangerous environment to the drivers.