Using division, write a relational algebra expression that produces all students who CrsCode,Semester have taken all courses that have been o?ered. (If a course has been o?ered more than once, they have to have taken it at least once.)
What will be an ideal response?
?StudId,CrsCode(Transcript)/?CrsCode(Teaching)
You might also like to view...
Give an example of when you would want to use a multitasking system.
What will be an ideal response?
Suppose you are considering the best way to present a round-table discussion of students discussing their reasons for choosing their majors. You know that your users are accessing the Web using a 56Kbps modem. You are considering the following possibilities:
i. Four images each having a resolution of 400x600 and a file size of 250 KB each plus four audio clips that are 160 KB each. Each audio file is 20 seconds long. ii. Four video clips having a resolution of 160x120 and a file size of 375 KB Answer the following questions: a. For each of these possibilities, what is the overall download time? Since your users are accessing the Web with a 56Kbps modem, use the estimate of 3 minutes per megabyte. b. What is the difference in download times? Give the answer in minutes. Which possibility has the faster download time? c. It’s always important to consider download time when choosing a multimedia presentation. In this case, it’s probably better to choose the possibility that has the slower download time. Why?
What is y displayed?
``` public class Test { public static void main(String[] args) { int x = 1; int y = x + x++; System.out.println("y is " + y); } } ``` a. y is 1. b. y is 2. c. y is 3. d. y is 4.
On some types of computers, a screen can be an input and an output device
Indicate whether the statement is true or false