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);
<span>public static int methodName(int a, int b){
a = a * 2;
b = b * 2;
}
</span><span>int result = doubling(5, 10<span>);
System.out.println(result);
//result would be 10, 20</span></span>
Answer:
metrics
Explanation:
Given that Metrics is Metrics is an accepted technique of measuring quantities of elements or commodities.
It is used in all facets of human activities particularly in value measurement such as production operation, financial assessment, comparison purposes, etc.
Hence, In addition to benchmark testing, performance measurements, called METRICS, can monitor the number of transactions processed in a given period, the number of records accessed, and the volume of online data.
Answer:
As a design rule, access points within range of each other should be set to channel frequencies with minimal signal overlap. Users will find that roaming doesn’t work well, and performance will degrade because of interference between access points.
Explanation:
Answer:
A pedestal. It involves moving the camera upwards or downwards in relation to a subject.
