Answer:
d is the correct answer for this problem
Suppose you are given a relation R with four attributes ABCD. For each of the following sets of FDs, assuming those are the only dependencies that hold for R, do the following: (a) Identify the candidate key(s) for R. (b) Identify the best normal form that R satisfies (1NF, 2NF, 3NF, or BCNF). (c) If R is not in BCNF, decompose it into a set of BCNF relations that preserve the dependencies.
1. C → D, C → A, B → C
2. B → C, D → A
3. ABC → D, D → A
4. A → B, BC → D, A → C
5. AB → C, AB → D, C → A, D → B
Solution :
1.
a). Candidate keys : [tex]$B$[/tex]
b). R is in [tex]$2F$[/tex] but not [tex]$3NF$[/tex]
c). C → [tex]$D$[/tex] and C → [tex]$A$[/tex], both causes violations of [tex]$BCNF$[/tex]. The way to obtain the join preserving decomposition is to decompose [tex]$R$[/tex] into [tex]$AC, BC$[/tex] and CD.
2.
a). Candidate keys : [tex]$BD$[/tex]
b). [tex]$R$[/tex] is in [tex]$1NF$[/tex] but not [tex]$2NF$[/tex].
c). Both B → [tex]$C$[/tex] and D → [tex]$A$[/tex] cause [tex]$BCNF$[/tex] violations. The decomposition : [tex]$AD $[/tex], [tex]$BC, BD$[/tex] is [tex]$BCNF$[/tex] and lossless and the join preserving.
3.
a). Candidate keys : [tex]$ABC, BCD$[/tex]
b). R is in [tex]$3NF$[/tex] but not [tex]$BCNF$[/tex]
c).[tex]$ABCD$[/tex] is not in [tex]$BCNF$[/tex] since D → [tex]$A$[/tex] and [tex]$D$[/tex] is not a key. But if we split up the [tex]$R$[/tex] as [tex]$AD,BCD$[/tex] therefore we cannot preserve dependency [tex]$ABC$[/tex] → D. So there is no [tex]$BCNF$[/tex] decomposition.
4.
a). Candidate keys : [tex]$A$[/tex]
b). R is in [tex]$2NF$[/tex] but not [tex]$3NF$[/tex]
c). BC → [tex]$D$[/tex] violates [tex]$BCNF$[/tex] since [tex]$BC$[/tex] does not contain the key. And we split up R as in [tex]$BCD, ABC$[/tex].
5.
a). Candidate keys : [tex]$AB, BC, CD, AD$[/tex]
b). [tex]$R$[/tex] is in [tex]$3NF$[/tex] but not [tex]$BCNF$[/tex].
c). C → [tex]$A$[/tex] and D → [tex]$B$[/tex] both causes a violations. The decomposition into [tex]$AC,BCD$[/tex] but this will not preserve [tex]$AB$[/tex] → C and [tex]$AB$[/tex] → D, and [tex]$BCD$[/tex] is still not [tex]$BCNF$[/tex] because [tex]$D$[/tex] → [tex]$B$[/tex]. So we need to decompose further into [tex]$AC,BD,CD$[/tex] However when we try to revive the lost functional dependencies by adding [tex]$ABC$[/tex] and [tex]$ABD$[/tex], we that these relations are not in [tex]$BCNF$[/tex] form. Therefore, there is no [tex]$BCNF$[/tex] decomposition.
Describe and evaluate the working memory model of memory (16 marks)
Answer: The working memory model is a cognitive model of short term memory comprised of three main components; the central executive, the visuo-spatial sketchpad and the phonological loop. ... they suggests the components of working memory all have limited capacity.
metals are the best materials for making shoes. what do you think?
Answer: Leather is flexible yet durable, as sturdy as it is supple. Fabric is also quite commonly used for making shoes. .
match the cell reference to its definition
Answer:
which cell reference:-|
Answer:
absolute reference: the cell remains constant when copied or moved.
mixed reference: the cell has a combination of two other types of cell references.
relative reference: the cell changed based on the position of rows and columns.
Which Fiber implementation is often referred to as Fiber To The Premises (FTTP)? Check all that apply.
Answer:
FFTH Fiber to the home, FFTB Fiber to the building.
What is computer? Give short answer for this
Answer:
electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
Explanation:
..
Alex, a webmaster, recently deployed a new web server. After checking external access to the new web server, he was unable to communicate on port 80. Alex verified that the host-based firewall's configuration had been changed and that the httpd service is running. What commands will most likely resolve the communication issue?
Answer:
systemctl restart firewalld
Explanation:
The command that will most likely resolve the communication issue being experienced by Alex ( i.e. his inability to communicate on port 80 ) is
systemctl restart firewalld given that the host-based firewall's configuration has been changed
The process of converting an input file (stream of characters) into an understandable format is called syntax analysis.
a. True
b. False
Answer:
The given statement is "True".
Explanation:
The framework for considering a string of characters, throughout the basic language, database management system, or DS by formal grammatical codes or syntax, is considered as a Syntax analysis.During a lexical analysis stage, everything just accepts or considers the tokens created as an input as well as creates a parse tree as an output or outcome.Thus the above is the correct response.
Earth, Wind & Fire were NOT known for combining many different styles of music together.Required to answer. Single choice.
(1 Point)
True
False
Answer:
false
Explanation:
Cause I don't believe you can't use earth, wind,and fire to create music.
ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP ASAP NEED HELP
Answer:
13.c
14.d
15.b
16.a
17.c
Explanation:
please brainleist please ☻☺️❤♨️
Which of the following is NOT a possible combination of values of the variables in this program when it finishes running?
A. tails has a value of O and heads has a value of 100
B. tails has a value of 100 and heads has a value of O
C. tails has a value of 20 and heads has a value of 20
D. tails has a value of 50 and heads has a value of 50
Answer:
Definitely D
Explanation:
When you flip a coin it’s a 50/50 chance. Meaning it’s equal.
Given that they are familiar with what the tails have a value of 50 variables stand for and heads have a value of 50, programmers will find it simpler to read and comprehend the code, hence option D is correct.
What is a combination of values of the variables?Almost all programming languages use a similar technique for saving values in variables: we place the variable name on the left side of the equal sign (=), and the value we wish to store on the right.
Print the variables in reverse order in addition to the entered order by typing the variables backward.
In addition to printing the sequence in reverse, print the double's int casting value by placing (int) before the variable name, tails has a value of 50 and heads has a value of 50, hence option D is correct.
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Arrange the given binary numbers in increasing order of their decimal equivalent. 110111 101101 110010 111110
Answer:
101101 < 110010<110111 <111110
Explanation:
We will convert binary number to their decimal equivalent
110111 - (1 × 2⁵) + (1 × 2⁴) + (0 × 2³) + (1 × 2²) + (1 × 2¹) + (1 × 2⁰) = (55)₁₀
101101 - (1 × 2⁵) + (0 × 2⁴) + (1 × 2³) + (1 × 2²) + (0 × 2¹) + (1 × 2⁰) = (45)₁₀
110010 - (1 × 2⁵) + (1 × 2⁴) + (0 × 2³) + (0 × 2²) + (1 × 2¹) + (0 × 2⁰) = (50)₁₀
111110 - (1 × 2⁵) + (1 × 2⁴) + (1 × 2³) + (1 × 2²) + (1 × 2¹) + (0 × 2⁰) = (62)₁₀
Now, arranging the given binary numbers in increasing order of their decimal equivalent , we get -
101101 < 110010<110111 <111110
Answer: 101101<110010<110111<111011<111110
used a binary translator.
Explanation:
The following text is encoded in rot13. "Qba'g gel gb or yvxr Wnpxvr. Gurer vf bayl bar Wnpxvr. Fghql pbzchgref vafgrnq." - Wnpxvr Puna Decode it, and paste the decoded text here: * How can I decide rot13
Answer: "Don't try to be like Jackie. There is only one Jackie. Study computers instead." - Jackie Chan
Explanation:
Do you use commas or periods in Terms Of Conditions?
For example,
in the following terms of conditions should be a comma or a period?
- Professionalism is required, (or period)
- You may not breach this document, (or period)
Furthermore, if a period is used, is the rest of the contract useless?
Answer:
yes u should use a period
Explanation:
3) Many people use the World Wide Web (Web) regularly, and search engines
provide vital access to Web resources. Textual and multimedia content is
accessible via web search engines. Informational, navigational, and
transactional intent are the three types of user intent classified for Web
searching. What is meant by navigational, informational, and transactional
search? Provide a comprehensive explanation with examples for each.
Answer: See explanation
Explanation:
Navigational search - This occurs when the user is looking for a certain website. Then the name of the website will be entered into the search bar.
Informational search - This occurs when the user wants to get a certain information. For example, if user enters "what is computer" into the search bar, different results relating to the word "computer" will be gotten.
Transactional search - This occurs when the user wants a website that is interactive it which possess more interaction. An example is when the user wants to buying something, register for something or maybe download something
Write a program whose input is two integers. Output the first integer and subsequent increments of 10 as long as the value is less than or equal to the second integer. Ex: If the input is: -15 30 the output is: -15 -5 5 15 25
Answer:
Explanation:
The following program is written in Python. It asks the user for two number inputs. Then it creates a loop that prints the first number and continues incrementing it by 10 until it is no longer less than the second number that was passed as an input by the user.
number1 = int(input("Enter number 1: "))
number2 = int(input("Enter number 2: "))
while number1 < number2:
print(number1)
number1 += 10
Which function deletes the first occurence of 3 in a list named listB ?
listB.clear(3)
listB(3)
listB delete(3)
listB.remove(3)
Answer:
[tex]listB.remove(3)[/tex]
Explanation:
Given
Options A to D
Required
Which deletes the first occurrence of 3
The options show that the question is to be answered using the knowledge of Python.
So, we analyze each of the options using Python syntax
(a) listB.clear(3)
In python, clear() is used to delete all elements of a list, and it does not take any argument i.e. nothing will be written in the bracket.
Hence, (a) is incorrect
(b) listB(3)
The above instruction has no meaning in Python
(c) listB delete(3)
The above instruction as written is an invalid syntax because of the space between listB and delete.
Also, it is an invalid syntax because lists in Python do not have the delete attribute
[tex](d)\ listB.remove(3)[/tex]
This removes the first occurrence of 3
Answer: listB delete(3)
Explanation: got it right on edgen
One view of intrusion detection systems is that they should be of value to an analyst trying to disprove that an intrusion has taken place. Insurance companies and lawyers, for example, would find such evidence invaluable in assessing liability. Consider the following scenario. A system has both classified and unclassified documents in it. Someone is accused of using a word processing program to save an unclassified copy of a classified document. Discuss if, and how, each of the three forms of intrusion detection mechanisms could be used to disprove this accusation.
Answer:
What kind off question is this wich programm do u use?
What is one benefit of using electronic flash cards?
Answer:
They can be searched using keywords. they may have a different alarm settings. they provide a personal organizer.
Explanation:
Hope this helped Mark BRAINLIEST!!!
Answer:
One benefit would be that you can study them anytime without losing an actual paper flash card.
Explanation:
Hope this helps!
Let's make a song, continue from these lines
My heart is dead
My mind is in a loop
My head hurts
Underpressure
Explanation:
a trance that I cant stop
A real estate office handles 50 apartment units. When the rent is $600 per month, all the units are occupied. However, for each $40 increase in rent, one unit becomes vacant. Each occupied unit requires an average of $27 per month for maintenance. How many units should be rented to maximise the profit?
What is the code for Python?
Answer:
452
Explanation:
63. Name the 4 main lights & and their primary purpose.
What is one advantage of using the Option Group Control for data validation? It works best with fields that use the date data type. It alerts the user when the database is about to close. It applies to numeric fields only, eliminating text errors. The data entry is restricted to specific fields, reducing errors.
Answer:
The Data Entry is Restricted to Specific Fields, Reducing Errors
Explanation:
Answer:
D
Explanation:
edge2021
What is artificial Intelligence ?
Answer:
Artificial intelligence (AI) is intelligence demonstrated by machines, unlike the natural intelligence displayed by humans and animals, which involves consciousness and emotionality. The distinction between the former and the latter categories is often revealed by the acronym chosen. 'Strong' AI is usually labelled as artificial general intelligence (AGI) while attempts to emulate 'natural' intelligence have been called artificial biological intelligence (ABI). Leading AI textbooks define the field as the study of "intelligent agents": any device that perceives its environment and takes actions that maximize its chance of successfully achieving its goals.Colloquially, the term "artificial intelligence" is often used to describe machines that mimic "cognitive" functions that humans associate with the human mind, such as "learning" and "problem solving".
As machines become increasingly capable, tasks considered to require "intelligence" are often removed from the definition of AI, a phenomenon known as the AI effect.A quip in Tesler's Theorem says "AI is whatever hasn't been done yet." For instance, optical character recognition is frequently excluded from things considered to be AI,having become a routine technology. Modern machine capabilities generally classified as AI include successfully understanding human speech,]competing at the highest level in strategic game systems (such as chess and Go), and also imperfect-information games like poker,[11] self-driving cars, intelligent routing in content delivery networks, and military simulations.
Artificial intelligence was founded as an academic discipline in 1955, and in the years since has experienced several waves of optimism,followed by disappointment and the loss of funding (known as an "AI winter") followed by new approaches, success and renewed funding.[ After AlphaGo successfully defeated a professional Go player in 2015, artificial intelligence once again attracted widespread global attention.For most of its history, AI research has been divided into sub-fields that often fail to communicate with each other. These sub-fields are based on technical considerations, such as particular goals (e.g. "robotics" or "machine learning"),the use of particular tools ("logic" or artificial neural networks), or deep philosophical differences. Sub-fields have also been based on social factors (particular institutions or the work of particular researchers
Explanation:
Hopefully u will satisfy with my answer of ur question..!!Please Mark on brainleast please..!!Have a nice day ahead dear..!!Answer:
Uhm
Explanation:
What the other person said.
**PLEASE AN IPO CHART AND A C++ PROGRAM FOR EACH QUESTION**
20. When you borrow money to buy a house, a car, or for some other purpose, you repay the loan by making periodic payments over a certain period of time. Of course, the lending company will charge interest on the loan. Every periodic payment consists of the interest on the loan and the payment toward the principal amount. To be specific, suppose that you borrow $1,000 at an interest rate of 7.2% per year and the payments are monthly. Suppose that your monthly payment is $25. Now, the interest is 7.2% per year and the payments are monthly, so the interest rate per month is 7.2 / 12 5 0.6%. The first month’s interest on $1,000 is 1000 3 0.006 5 6. Because the payment is $25 and the interest for the first month is $6, the payment toward the principal amount is 25 2 6 5 19. This means after making the first payment, the loan amount is 1, 000 2 19 5 981. For the second payment, the interest is calculated on $981. So the interest for the second month is 981 3 0.006 5 5.886, that is, approximately $5.89. This implies that the payment toward the principal is 25 2 5.89 5 19.11 and the remain- ing balance after the second payment is 981 2 19.11 5 961.89. This process is repeated until the loan is paid. Write a program that accepts as input the loan amount, the interest rate per year, and the monthly payment. (Enter the interest rate as a percentage. For example, if the interest rate is 7.2% per year, then enter 7.2.) The program then out- puts the number of months it would take to repay the loan. (Note that if the monthly payment is less than the first month’s interest, then after each payment, the loan amount will increase. In this case, the program must warn the borrower that the monthly payment is too low, and with this monthly payment, the loan amount could not be repaid.)
28. (Apartment problem) A real estate office handles, say, 50 apartment units. When the rent is, say, $600 per month, all the units are occupied. However, for each, say, $40 increase in rent, one unit becomes vacant. Moreover, each occupied unit requires an average of $27 per month for maintenance. How many units should be rented to maximize the profit?
Write a program that prompts the user to enter:
a. The total number of units.
b. The rent to occupy all the units.
c. The increase in rent that results in a vacant unit.
d. Amount to maintain a rented unit.
The program then outputs the number of units to be rented to maximize the profit.
30. Let n be an integer. The value of the expression lim (1 1 1 ) is n→` n written as e. This number e appears in many places in mathematics. For example, it appears in the formula A 5 Pert to compute the total mount accumulated when the interest is compounded continuously. It also appears in problems relating to exponential growth and decay. It is known that e is an irrational number. The value of e to nine decimal places is e 5 2.718281827. Write a program that computes the value n of the expression lim (1 1 1 ) between certain values of n and then n→` n compare the values with e. For example, you can compute the values of the expression between 100 and 10,000 with an increment of 100, or between 1,000 and 1,000,000 with an increment of 1,000.
answer is b
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Peter is explaining the steps to create a fire effect in an image to his class. Help Peter pick the correct word to complete the explanation.
After your text is created, duplicate the layer so that you have two versions. Next, apply a number of blank
options to the duplicated text layer.
Answer:
The answer would be "Blending"
Explanation:
I took the test and checked over my answers
Write a program that asks the user to enter their yearly income. The program should display the user's tax bracket according to the following guidelines: Income below $50,000: Tax Bracket 1 Income of $50,000 - $99,999.99: Tax Bracket 2 Income of $100,000 or above: Tax Bracket 3 The program should then output the amount of federal taxes they will have to pay given that the Federal Tax Rate is 15% (for all tax brackets).
Answer:
Explanation:
The following Python code asks the user for their yearly income as an input, saves it into a variable called income. Then it analyzes that value and outputs their correct Tax Bracket using IF statements. Then it calculates the amount of tax they must pay and outputs that value.
income = input("Enter your yearly income: ")
if int(income) < 50000:
print("You are in Tax Bracket 1")
elif (int(income) >= 50000) and (int(income) <= 99999.99):
print("You are in Tax Bracket 2")
else:
print("You are in Tax Bracket 3")
tax = int(income) * 0.15
print("You need to pay a total of $" + str(tax) + " in income tax")
What are the advantages and disadvantages of the lenses used on cameras in capturing black and white film?
The lenses that are used on cameras in capturing black and white film are vital for creating timeless pictures and highlighting the shape and pattern in the image.
Black and white photography is an image where all the colors have been removed. This can be by choice of the photographic film.
The advantage of the lenses used on cameras in capturing black and white film:
It's vital for creating a timeless picture.It highlights form, shape, and pattern.It's vital in distancing the content material from reality.The disadvantage of the lenses used on cameras in capturing black and white film is that it lacks emotions which a colored photograph will have reflected.
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Advantages that can be associated with the lens of of camera that is utilized in capturing black and white film are:
It helps to give the highlight of the pattern and shape of the content.
It can be stored for longer time ( timelessness).
disadvantages that can be associated with the lens of of camera that is utilized in capturing black and white film is that it doesn't portray emotions.
Black and white photography can be regarded as one that doesn't contain variety of color.It is a photography that doesn't portray an emotion, emotions in this sense means color, which serves a disdvantage.We can conclude that this type of photography give room fir a picture that can remain for long time, it's timeless and this serve as one of the advantage.
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the more you take the more you lose
.....................
what can a user modify on a business card using the Edit Business card in the dialog box?
