TUDENT(SID, NAME, YEAR, MAJOR) DEPARTMENT(DID, NAME, CHAIR) PROFESSOR(PID, NAME, DEPT, SALARY) COURSE(CID, NAME, CREDITS, PROF) TAKE(SID, CID, YEAR, SEMESTER, GRADE) TEACH(PID, CID, YEAR, SEMESTER) Note that MAJOR is a foreign key for DEPARTMENT.DID and DEPT is a foreign key for DEPARTMENT.DID as well. YEAR is an integer. SALARY represents currency (2 decimal places). CREDITS is an integer. PROF (in relation COURSE) is a foreign key for PROFESSOR. TAKE.CID is a foreign key for COURSE. TAKE.SID is a foreign key for STUDENT. Similarly for TEACH. SEMESTER is an integer. Use whichever renaming convention from class that you like, but ensure you are consistent (i.e. use the same convention everywhere). You can feel free to use any operators of the extended RA introduced in class (nt, p, 0, X, -, U, N, 7, y). 2. Write the following queries as Relational Algebra (RA) expressions.
-find professors who taught exactly one course in at least three semesters.

Answers

Answer 1

The RA expression groups and counts distinct semesters and courses, selects where the semester count is at least 3 and course count is 1, and joins with PROFESSOR.

To find professors who taught exactly one course in at least three semesters, we can use the following Relational Algebra (RA) expression:
1. First, group by PID and CID, and count the number of distinct semesters for each group:
  γ_PID, CID; COUNT(TEACH.SEMESTER) -> (TEACH)
2. Select the groups where the count of distinct semesters is at least 3:
  σ_COUNT(TEACH.SEMESTER) >= 3(γ_PID, CID; COUNT(TEACH.SEMESTER) -> (TEACH))
3. Now, group by PID and count the number of distinct courses for each professor:
  γ_PID; COUNT(σ_COUNT(TEACH.SEMESTER) >= 3(γ_PID, CID; COUNT(TEACH.SEMESTER) -> (TEACH)).CID) -> (RESULT)
4. Select the groups where the count of distinct courses is exactly 1:
  σ_COUNT(CID) = 1(γ_PID; COUNT(σ_COUNT(TEACH.SEMESTER) >= 3(γ_PID, CID; COUNT(TEACH.SEMESTER) -> (TEACH)).CID) -> (RESULT))
5. Finally, join the result with the PROFESSOR relation to get the professors' information:
  PROF ⨝_PID=PID σ_COUNT(CID) = 1(γ_PID; COUNT(σ_COUNT(TEACH.SEMESTER) >= 3(γ_PID, CID; COUNT(TEACH.SEMESTER) -> (TEACH)).CID) -> (RESULT))
This RA expression will provide the information about professors who taught exactly one course in at least three semesters.

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Related Questions

A Project Manager (PM) identifies several processes within a team that could be automated to reduce the manual, repetitive tasks they perform. The PM is looking for help creating an automation strategy and deciding the best approach to move forward.

Which team in their organization can the PM contact for help?

Answers

The center of excellence because it uses the team wherein the organization is supported by PM contact.

This Information on the automation plan. It implies that the reusable & automated scripts & approaches by the department in question, for example, QA mentor should be designed.It is the full idea for automatic investment return testing, test correctness, etc. Therefore, the team where PM interaction helps the firm must be at the center of excellence.

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The macro command is available on the
tab.
O Home
insert
O View
O Design

Answers

This answer confuses me a bit (i know this doesnt help much) but, you can run the macro by clicking the macro button on the Quick Access Toolbar/ Developer tab or pressing a combination of keys, like a shortcut.

true or false? the arp cache contains every mac address and corresponding ip address the host will use.

Answers

The Address Resolution Protocol or ARP cache contains every MAC address and corresponding IP address that will be used by the host. Therefore, this refers to a true statement.

The Address Resolution Protocol or ARP is a layer 2 protocol that is used to map MAC addresses to IP addresses. On a network, all hosts are located by their IP address, but NICs do not have IP addresses, they use MAC addresses. Thus, ARP provides a critical mapping function in the Internet protocol suite to associate the IP address with a MAC address.

For example, in order to transmit data over a network, the ARP cache contains every MAC address with associated IP address of the host.

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What is the name of the technology that integrates vast data bases with georeferenced data in order to design, plan, and manage urban environments

Answers

Answer:

"Geographic information systems " is the right answer.

Explanation:

This is indeed a computer-based method for observing and analyzing current events that are happening on the planet. GIS could enhance teaching and learning begin to understand geographical trends and regularities by relaying completely unconnected information.It represent an experimental field and while the GIS supplier government offers us modern, improved, and quicker technical resources for the computer hardware.

Which symbol is used to indicate that a formula may contain an error?
A. green triangle in upper-left corner of cell
B. an orange circle below the formula result
C. green triangle with question mark inside
D. a wavy purple arrow above the formula result

Answers

Answer:A.

Explanation:

Just had this question if is A

Answer:

its A they right

Explanation:

6. describe how to resolve the m:n relationship between sale and available tune.

Answers

The m:n relationship between sale and available tune can be resolved through the use of a junction table.

This table acts as a bridge between the two entities and contains foreign keys from both the sale and available tune tables. First, identify the primary keys of both the sale and available tune tables to create the junction table. These will be used as foreign keys in the junction table. The junction table will also contain any additional fields needed to record information about the relationship between the two entities, such as the date of the sale or the price paid. Overall, the use of a junction table is an effective way to resolve m:n relationships between entities.


Once the junction table is created, the m:n relationship can be resolved by inserting records into the junction table. Each record represents a sale of a specifically available tune and contains the foreign keys from the sale and available tune tables and any additional information. Queries can be used to retrieve information about the relationship between sales and available tunes. For example, a query can be used to find all available tunes that have not been sold or to find all sales of a specifically available tune.


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tamara is behind on her work as an analyst and decides she needs to do some work at home tonight. she copies the files she has been working on (which contain phi) to a flash drive and drops the flash drive in her purse for later use. when tamara gets home, the flash drive is missing. is this a security breach?

Answers

On the way home from work, Tamara who works as an analyst decides she needs to do some advanced work at home tonight. The files that he had copied and worked on at the office were stored on the flash drive, but when he got home the flash drive was gone. The incident that Tamara experienced was not a security breach.

What is security breach?

A security breach is any incident or occurrence that results in unauthorized access to data on a computer, on an application, on a network, or on a device. This will result in information being accessed without involving authorization. This leads to unauthorized access to information.

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true/false. the output unit of a pc performs calculation and logical decisions.

Answers

The given statement, "The output unit of a pc performs the calculation and logical decisions" is false, because the output unit of a PC is responsible for displaying information to the user and presenting the results of calculations and logical decisions made by the computer's processor.

The output unit of a PC is critical in displaying data and information in a way that the user can readily see and understand. This category contains monitors, printers, speakers, and other output peripherals. Its major role is to translate processed data into a human-readable form or format, allowing users to efficiently engage with the computer system.

While the output unit can display the results of the computer's processor's calculations and logical decisions, it is important to note that the actual execution of these calculations and logical decisions take place within the central processing unit (CPU) or other components of the computer system. The output unit's role is to convey the processed information to the user in a meaningful way, whether through visual, auditory, or other sensory means.

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8. What part of the desktop is this? O Icons O Folder O Notification area O Start button​

8. What part of the desktop is this? O Icons O Folder O Notification area O Start button

Answers

Answer:

i think its cortana

icons

Explanation:

Answer:

It's an Icon. Hope this helps please mark me BRAINLIEST

what are some possible questions that you think would be helpful for an entrepreneur to ask people who are interacting with their prototype?

Answers

Answer:

What challenges did you encounter while using the prototype, which may have made it difficult to use?

Would you recommend the prototype to others? Why or why not?
What do you think could be improved in the prototype?

Explanation:

These questions are open-ended and allow for the audience at hand to give their personal thoughts and opinions, rather than confining them to yes or no questions that provide little constructive feedback.

Availability is an essential part of ________ security, and user behavior analysis and application analysis provide the data needed to ensure that systems are available.

Answers

Answer:

Network

Availability is an essential part of Network security, and user behavior analysis and application analysis provide the data needed to ensure that systems are available.

4. Write technical term for the following statements
A) The computers designed to handle specific single tasks.
B) The networked computers dedicated to the users for professional wrok.
C) The computers that uses microprocessor as their CPU.
D) A computer that users analog and digital device.
E) The computer that processes discontinuous data.
F) The portable computer which can be used keeping in laps.
G) The general purpose computers used keeping on desk. ​

Answers

Answer:

a) Special-purpose computer

b)

c)microcomputers

d) hybrid computer

e) digital computer

f) laptop computers

g) desktop computers.

Please mark me as brainlist :)

What file format would be required a coworker need to edit a layer in a photoshop file 
-png
-psd
-pdf
-jpeg

Answers

psd, others can’t save photoshop data, only the image as a whole

Need Help! Asap 7.5 code practice (Edhesive)

Need Help! Asap 7.5 code practice (Edhesive)

Answers

Answer:

Make main function

def main():

Make some constants for the grades

A = 5.0 or 4.0

B = 4.0 or 3.0

C = 3.0 or 2.0

D = 2.0 or 1.0

F = 1.0 or 0.0

In the main function call the function you made and make sure to use those constants for help

also don't forget to call your main function or nothing will work

Explanation:

Making the main function is good programming practice for your future

Making the constants is also helpful to your programming.

Now how it works you call the function you wrote to calculate the grade.

I don't know how helpful this was this is one of my first answers. I am `also answering how I would do it

For this challenge you will need to write a program that will produce the display for the individual frames, given the user inputting the number of pins knocked down in each frame of bowling.
Rules:
• The game of bowling consists of 10 frames, where a player gets 2 attempts to knock down 10 pins.
• If the player knocks down all 10 pins on the first roll, that should be displayed as X, and the next number will be the first roll of the next frame.
• If the player doesn't knock down any pins, that should be displayed as -
• If the player gets a spare (knocks down the remaining pins on the second roll of the frame, that should be displayed as /
The user will input integers tha represent the number of pins that have been kncked down on each roll. The list is not a fixed size, as bowling a perfect game requires only 12 rolls, while most games would use more rolls. Use anvil to make this and send the link.

Answers

This method takes a list of numbers that represent how many pins were knocked down on each roll and outputs a string that displays the separate frames in accordance with bowling rules.

In bowling, how many pins are there?

At the start of each frame, ten pins are placed at the end of the bowling lane. With the triangle's point towards the bowler, they are positioned in a triangle arrangement.

function score(display frames):

body num = 1

0 for roll num

Result: ""

range(len(scores)) for I

If roll num = 3 and frame num = 10:

break

If roll num = 1 and scores[i] = 10:

result += "X "

frame num plus one

if roll num == 1, then

score(s[i]) + output += str(i) + " "

roll num plus one

else:

if scores[i-1] plus scores[i] equal 10, then

result += "/ "

else:

score(s[i]) + output += str(i) + " "

frame num plus one

0 for roll num

bring back output.strip ()

# A sample of usage

Result = [10, 7, 3, 9, 0, 10, 0, 8, 8, 2, 0, 6, 10, 10, 10, 8, 1]

print(display frames(scores)) # Results: X 7/9 - X 0/8 - X X/X/X 8 1

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Which of the following is true regarding Moore’s Law?

designed to predict the growth in computing capabilities resulting from the use of quantum computers
designed to predict the growth in computing capabilities resulting from the use of quantum computers

explained the growth in computing capabilities between 1965 and 1995
explained the growth in computing capabilities between 1965 and 1995

is likely to continue accurately predicting growth for the foreseeable future
is likely to continue accurately predicting growth for the foreseeable future

states that processing power doubles every two years
states that processing power doubles every two years

Answers

States that processing power doubles every two years

gourmet pizza shop with a
Question 19
What type of competition does Netflix and a movie theater represent for each other?
A Weak direct competition
B Strong direct competition
C Indirect competition
D Global competition

Answers

Answer:

B.Strong direct competition.

Explanation:

Netflix can be viewed by anyone and at anytime.

Strong direct competition is the type of competition does Netflix and a movie theatre represent for each other. Hence, option B is correct.

What is Strong direct competition?

Direct competition occurs when multiple companies compete for the same market by offering the same product or service. There are several common examples of this.

One is the rivalry between McDonald's and Burger King; specifically, the Whopper and the Big Mac are bitter rivals. Direct competition is when two or more enterprises directly compete for the same potential market by offering almost similar goods or services.

Are actions taken by public authorities or governments to lessen the competitiveness of imported goods and services in comparison to locally produced ones. poor straight competitor The primary concentration is on one product.

Thus, option B is correct.

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what is an overview of your opinion of Digital Etiquette? Do not look it up bc I will know!

Answers

Answer:

I think digital etiquette is good and it should be know all around the world.

Explanation:

Python String Functions: Create a new Python Program called StringPractice. Prompt the user to input their name, then complete the following:
Length
• Print: “The length of your name is: [insert length here]”
Equals
• Test to see if the user typed in your name. If so, print an appropriate message

Really appreciate the help.

Answers

#Swap this value by your name. Mine is Hamza :)

my_name = "Hamza"

#Get input from user.

inp = input("What's your name?: ")

#Print the length of his/her name.

print("The length of your name is",len(inp),"characters.")

#Check if the input matches with my name?

#Using lower() method due to the case insensitive. Much important!!

if(inp.lower()==my_name.lower()):

   print("My name is",my_name,"too! Nice to meet you then.")

Attacks that exhaust all possible password combinations in order to break into an account are called _____ attacks.

Answers

Answer:

Brute force

Explanation:

Brute force means forcing your way into logging into an account.

This is done by trying all kinds of passwords, starting from something like "123456" to your birthday and getting increasingly complex passwords in the hope that the account has a weak password

Hardware failure, power outages, and DOS attacks will affect:

data confidentiality.

data integrity.

data verification.

data availability.

Answers

Answer:

The answer should be data availability

Which wireless standard can stream data at a rate of up to 54 mbps using a frequency of 5 ghz?.

Answers

Answer:

802.11a can stream data at a rate of up to 54 Mbps using a frequency of 5 GHz.

Explanation:

All user input is processed by the CPU once every cycle. The CPU does everything in its power to perform more than one instruction per cycle. The higher the cycle number, the more often a processor can process.

Answers

Answer:

True

Explanation:

The statement being made is true. The CPU cycle is also known as the clock speed of the CPU because every cycle represents one instruction that was completely finished by the CPU. The higher the clock speed the more instructions that can be completed in a certain amount of time. The second feature that also drastically increases the number of instructions that can be processed in a certain amount of time is whether or not the CPU has multi-thread functionality. This is a feature in some CPU's that allow the CPU to perform more than one process at the same time, this can be 4, 8 , or 16 processes at a time depending on the CPU.

A program is written to compute the sum of the integers from 1 to 10. The programmer, well trained in reusability and maintainability, writes the program so that it computes the sum of the numbers from k to n. However, a team of security specialists scrutinizes the code. The team certifies that this program properly sets k to 1 and n to 10; therefore, the program is certified as being properly restricted in that it always operates on precisely the range 1 to 10. List different ways that this program can be sabotaged so that during execution it computes a different sum, for example, 3 to 20.

Answers

Answer:

See explanation section

Explanation:

See the program at the end of this solution

The program can be sabotaged if the source file is altered before running the program.

Take for instance,

Someone changes

for(int i =k;i<=n;i++)

to

for(int i =3;i<=20;i++)

This implies that no matter the user input, the program will only calculate the sum of 3 to 20

It is also possible that the program is altered by an external process.

Take for instance;

n = 10

k = 1

And the sum has been calculated for the range of k = 1 to 5.

Then the program is altered by an external process.

15 (sum of 1 to 5) will be displayed instead of 55 (sum of 1 to 10)

Program written in C++

#include<iostream>

using namespace std;

int main() {

int k.n,total=0;

cin>>k;

cin>>n;

//Assume k will always be less than n

for(int i =k;i<=n;i++) {

total+=i;

}

System.out.print(total);

return 0;

}

Multiple
Choice
What will be the output?
class num:
def __init__(self,a):
self. number = a
def_mul__(self, b)
return self.number + b.number
numA = num(5)
numB = num(10)
product = numA * numb
print(product)
50
O 5
an error statement
15

Multiple ChoiceWhat will be the output?class num:def __init__(self,a):self. number = adef_mul__(self,

Answers

Answer:

15

Explanation:

Edge 2021

Multiple ChoiceWhat will be the output?class num:def __init__(self,a):self. number = adef_mul__(self,

What was the first show produced on TV?

Answers

The first television show is "The Queen's Messenger " which aired on September 11, 1928.

What was the The Queen's Messenger?

It was a drama produced by AT&T and was broadcast from New York City. The program featured scenes with actors and was transmitted using experimental television equipment.

However, it is important to note that this early television broadcast was limited in range and only viewed by a small number of people in select locations. Also there were other experimental broadcasts and demonstrations of television technology that preceded "The Queen's Messenger," but they were not necessarily considered regular shows.

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Cybersecurity breaches in the workplace generally happen because _____. Select 3 options.


people make unintentional mistakes


people do not know about cybersecurity protocols


workplaces tend to have too strict cybersecurity protocols


cybersecurity specialists do not really help


people deliberately try to hack into the network

Answers

Answer:

people make unintentional mistakes

people do not know about cybersecurity protocols

people deliberately try to hack into the network

Explanation:

Cyber security breaches are the compromise to the data integrity of a computer system or network. There are several reasons why this can happen in the network f an organization. Some of them include;

1. People make unintentional mistakes: Human error has been attributed to be the leading cause of cybersecurity breaches. When people unknowingly expose passwords and sensitive data to those who should not have access to them, they commit a breach of security.

2. People do not know about cybersecurity protocols: When people are not educated on the right security measures to adhere to, they are prone to unknowingly engage in acts that will lead to a security breach.

3. People deliberately try to hack into the network: People within and outside the organization can decide to compromise the network especially if they believe that they will have some financial benefits.

__________ attribute specifies the height of the image.

Answers

Answer: The height attribute specifies the height of an image.

Explanation: Hope That Helps! (:

how move the word up one row using the keyboard shortcut on word mac book

Answers

The shortcut key that we can use on a MacBook to go one row up in the word is Alt + shift + up Arrow.

What are keyboard Shortcuts ?

A keyboard shortcut, sometimes referred to as a hotkey, is a set of one or more keys used in computers to quickly launch a software application or carry out a preprogrammed operation.

A shortcut on the keyboard is a set of keys you may press to carry out a computer instruction. In written writing, it is customary to combine keys that are intended to be struck simultaneously with a +. Ctrl+S, for instance, instructs you to simultaneously hit the Ctrl and S keys. There are several keyboard shortcuts available.

The shortcut key that we can use on a MacBook to go one row up in the word is Alt + shift + up Arrow.

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in 100 word, tell me who is a significant public figure who has the job profile as a "set designer" and explain why

Answers

A significant public figure who holds the job profile of a set designer is Sarah Jones.

Sarah Jones is a highly regarded and influential public figure in the field of set design. With her exceptional talent and creativity, she has made a significant impact on the world of film and theater. As a set designer, Sarah Jones is responsible for conceptualizing and creating the visual environment of a production. She collaborates closely with directors, producers, and other members of the production team to bring their vision to life. Sarah's expertise lies in her ability to transform abstract ideas into tangible and captivating sets that enhance the overall storytelling experience.

Sarah Jones' work is characterized by her meticulous attention to detail and her ability to capture the essence of a story through her designs. She carefully considers the mood, time period, and thematic elements of the production, ensuring that the set not only complements the performances but also adds depth and authenticity to the narrative. Sarah's portfolio includes a diverse range of projects, from period dramas to futuristic sci-fi films, each demonstrating her versatility and artistic vision.

In addition to her creative talents, Sarah Jones is known for her professionalism and effective communication skills. She understands the importance of collaboration and works closely with the entire production team to ensure a seamless integration of the set design with other elements such as lighting, costumes, and sound. Her ability to effectively translate ideas into practical designs, coupled with her strong organizational skills, makes her an invaluable asset to any production.

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multiply out 4(a-7) anyone who keeps awake till 3am... suppose the inflation rate is expected to be 7% next year, 6% the following year, and 4% thereafter. assume that the real risk-free rate, r*, will remain at 2% and that maturity risk premiums on treasury securities rise from zero on very short-term bonds (those that mature in a few days) to 0.2% for 1-year securities. furthermore, maturity risk premiums increase 0.2% for each year to maturity, up to a limit of 1.0% on 5-year or longer-term t-bonds.calculate the interest rate on 1-, 2-, 3-, 4-, 5-, 10-, and 20-year treasury securities. round your answers to two decimal places. Find an equation for the line with slope m= 11/12 and which goes through the point (60,7) Which of the following are examples of habitats where sympatric speciation could occur?Choose one or more:A.different locations along the Great Barrier coral reef in AustraliaB.opposite sides of a mountain rangeC.the North Rim and South Rim of the Grand CanyonD.an elevational gradient on the south-facing slope of a mountainE.varying water depths in a lake Find a Mobius transformation f such that f(0) = 0, f(1) = 1, f([infinity]) = 2, or explain why such a transformation does not exist. How did Thomas Jefferson Change after he became president Simplify24 x 2320x29leaving your answer in index form. Please help with these questions. Write answer for 19 and 20 thank you Two cross roads, each of width y units, run at right angles through the centre of a rectangular park of length 4x units and width 3x units. find the area of the remaining space in the park. why did student activism receive so much attention Does the ordered triple (0, -4,0) satisfy the following system of equations? Josh paid for four books with 3 20$ bills He received 16 $ in change Each book cost the same amount how much did each book cost What would be the measure of 306090None of these choices are correct. The low pressure system that passed through Dallas most likely caused what change? I am confused can somebody help meF ( - 5 ) = PLEASE HELP! will award brainliest! what is the cultural How should "free water" have been administered to the patient? What was true about malcom x as a member if the nation of islamA. He argued against African Americans making compromises with white society.B. He encouraged African Americans to work closely with white civil rights activists.C. He felt that if African Americans gained wealth, they would be viewed as equals by whites.D. He felt that African Americans needed whites to provide jobs and training.