1 Use water cooler
2 Avoid single use drink container for guests
3 Bring lunches in reusable containers
4 Paper waste reduction
take paperless notes
5 Use both sides of paper while printing, coping and writing
Answer:
Depends. could be an external opticial drive, a scuzi drive, a real to real tape system, or just a simple electromagnetic hard drive with speeds of 1000 rpm or more
Answer:
The code will produce:-
2.4
Explanation:
In this code the result of the arithmetic operation is stored in the variable c.On evaluating the expression it divides 12.0 by 5 which results in 2.4 and it is stored in float variable c.Then it is printed on the screen using print statement.Since the c is double variable so the result will be a decimal number.
Hence the answer is 4.
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:
A - 2
B - 3
C - 5
D - 4
E - 1
Explanation:
A. Virtual private network : 2
This is very useful when you have to work from home or visiting a client and need access to files/applications just like if you were at the office.
B. Email : 3
Yes, this is basically why the Internet was created in the first place.
C. Social networking sites : 5
Social networks are indeed a great marketing tool, allowing to target potential customers very precisely.
D. Search engines : 4
Yes, to find information about new products for the company, how the competitors are doing and so on.
E. Video and web conferencing: 1
Another great tool for employees working from home for example, or for employees located in an office at the other side of the country.
