Solution :
Here, we need to perform JOIN operation of the students and registration.
Use NATURAL JOIN operator 
and so no need to specify Join condition.
Also we need to selection operator tp select only those course whose major in "philosophy".
Finally we projection operator π to project only distinct students name who took at least three courses.
![$\pi [\sigma_{\text{student's nam}e} [ \sigma(\text{three courses}) \Join \text{"Philosophy"}]]$](https://tex.z-dn.net/?f=%24%5Cpi%20%5B%5Csigma_%7B%5Ctext%7Bstudent%27s%20nam%7De%7D%20%5B%20%5Csigma%28%5Ctext%7Bthree%20courses%7D%29%20%5CJoin%20%5Ctext%7B%22Philosophy%22%7D%5D%5D%24)
The insertion point is a blinking vertical line that indicates where the next typed character will appear, scroll box sheet tab insertion point split bar. It will be shown when you press a keyboard shortcut F2.
Answer:
Active listening is used to make things more clear when talking to other people. Whether it is on the phone or face to face active listening can reduce any unwanted barriers of communication. Getting rid of barriers can help a company save time rather than trying to explain things multiple times. This ultimately would lead to more goods or services being produced therefore making the company more efficient. There are many more reasons why this workplace tacit is useful but I personally believe this is one of the more used ways.
I really hope this works for you!
Answer:
Tabs
Explanation:
The ribbon contains the tabs. The tabs contain the command groups which hold commands
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Answer:
Application Software Type Examples
Word processing software MS Word, WordPad and Notepad
Database software Oracle, MS Access etc
Spreadsheet software Apple Numbers, Microsoft Excel
Multimedia software Real Player, Media Player
Presentation Software Microsoft Power Point, Keynotes
Explanation:
