Code a script4.js file that does uses map reduce to do a join of the customers and orders collections and summarizes the quantity of all items sold by zip code. Your output should have for each zip code, the count of items sold to customers in that zip code. Only list zip codes with a non zero quantity. If you do it correctly, you will get a quantity of 131 for zip code 38101. Submit the script4.js file.
Answers
Here is a sample code that demonstrates how to join two collections (customers and orders) and summarize the quantity of items sold by zip code using map reduce in MongoDB:
javascript
// Map function for customers collection
var mapCustomers = function() {
emit(this.zip_code, { type: 'customer', customer_id: this.customer_id });
};
// Map function for orders collection
var mapOrders = function() {
this.order_items.forEach(function(item) {
emit(this.shipping_address.zip_code, { type: 'order', quantity: item.quantity });
});
};
// Reduce function
var reduce = function(key, values) {
var count = 0;
values.forEach(function(value) {
if (value.type === 'order') {
count += value.quantity;
}
});
return { type: 'zip_code', count: count };
};
// Finalize function (optional)
var finalize = function(key, reducedValue) {
return reducedValue.count;
};
// Perform map reduce on customers and orders collections
db.customers.mapReduce(mapCustomers, reduce, { out: { inline: 1 }, scope: { mapOrders: mapOrders } });
db.orders.mapReduce(mapOrders, reduce, { out: { merge: "map_reduce_results" }, finalize: finalize, scope: { mapCustomers: mapCustomers } });
// Query the results
db.map_reduce_results.find({ value: { $gt: 0 } });
The mapCustomers function emits the zip code as the key and the customer ID as the value for each document in the customers collection. The mapOrders function emits the zip code as the key and the quantity sold as the value for each item in the order_items array of each document in the orders collection.
The reduce function sums up the quantities for each zip code, and the finalize function formats the output. The scope parameter is used to pass the other map function to mapReduce().
Finally, the results are queried using the find() method on the map_reduce_results collection.
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Related Questions
It is the way to convey a message,an idea,a picture,or speech that is received and understood clearly and correctly by the person for whom it is sent.
Answers
Answer:
Communication.
Explanation:
Communication can be defined as a process which typically involves the transfer of information from one person (sender) to another (recipient), through the use of semiotics, symbols and signs that are mutually understood by both parties.
In this context, communication is the way to convey a message, an idea, a picture, or speech that is received and understood clearly and correctly by the person for whom it is sent.
Generally, the linear model of communication comprises of four (4) main components and these are;
1. Sender (S): this is typically the source of information (message) or the originator of a message that is being sent to a receiver. Thus, they are simply the producer of a message.
2. Channel (C): this is the medium used by the sender for the dissemination or transmission of the message to the recipient. For example, telephone, television, radio, newspapers, billboards etc.
3. Message (M): this is the information or data that is being sent to a recipient by a sender. It could be in the form of a video, audio, text message etc.
4. Receiver (R): this is typically the destination of information (message) or the recipient of a message that is being sent from a sender.
¿importancia del técnico de soportes en redes y sistemas informáticos?
Answers
Answer:
responsable de manejar errores de instalación, problemas del usuario y cualquier otro problema técnico que impida que el cliente utilice su producto. En esencia, el soporte técnico se centra en ayudar a los clientes a utilizar un producto de forma más eficaz.
Can someone write this in java? Also, does anyone know how to do Edhesive assignments? I NEED HELP!!!!!
Answers
Answer is in the file below
tinyurl.com/wpazsebu
Match the process scheduling queue to its definition. Group of answer choices Job queue [ Choose ] Ready queue [ Choose ] Device/waiting queue
Answers
1. Job queue: The queue that holds all the processes in the system, including both active and waiting processes.
2. Ready queue: The queue that contains processes that are in main memory and are ready to be executed by the CPU.
3. Device/waiting queue: The queue that holds processes that are waiting for I/O operations to complete.
1. Job queue: The job queue is a process scheduling queue that holds all the processes in the system, regardless of their state. It includes both active processes that are currently being executed and waiting processes that are waiting for their turn to be executed. The job queue represents the overall pool of processes in the system.
2. Ready queue: The ready queue is a process scheduling queue that contains processes that are in main memory and are ready to be executed by the CPU. These processes have already undergone the necessary initialization and are waiting for their turn to be assigned to the CPU for execution. The ready queue represents the set of processes that are eligible and available to be executed.
3. Device/waiting queue: The device/waiting queue is a process scheduling queue that holds processes that are waiting for I/O (Input/Output) operations to complete. When a process initiates an I/O operation, it enters the device/waiting queue and waits for the I/O operation to finish. Once the I/O operation is complete, the process is moved back to the ready queue to resume execution. The device/waiting queue manages the processes that are temporarily blocked or waiting for resources or external operations to be performed.
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which computer belongs to the first generation?
Answers
what do we call, computing devices capable of being inserted or removed from a computer system that is running , without causing damage or affecting performance ?
Answers
Answer:
Where I work we call those hot-swappable or devices capable of "concurrent maintenance."
Explanation:
what is UTP in terms of network
Answers
Answer: Unshielded bent match (UTP) could be a omnipresent sort of copper cabling utilized in phone wiring and neighborhood region systems (LANs). There are five sorts of UTP cables recognized with the prefix CAT, as in category each supporting a distinctive sum of transfer speed.
Explanation:
hannes complains that his computer is always giving error messages, the file names and folder names are garbled, and there is an odd noise coming from his computer tower. which hardware device do you suspect is causing the problem?
Answers
Answer:
It could be the hard disk drive (HDD)
Prove that the set C of complex numbers is uncountable.
Answers
The set of complex numbers (C) is uncountable.
What can be said about the countability of the set of complex numbers?To prove that the set of complex numbers (C) is uncountable, we can employ Cantor's diagonal argument.
Assume that C is countable, implying that its elements can be listed in a sequence. Each complex number can be expressed as a + bi, where a and b are real numbers. By representing the complex numbers in a matrix-like arrangement, we can construct a diagonal number that differs from each number in the list.
This diagonal number can be created by changing the first digit after the decimal point of the first complex number, the second digit after the decimal point of the second complex number, and so on. The resulting diagonal number will differ from every complex number in the list. Hence, the assumption that C is countable leads to a contradiction.
Therefore, we conclude that the set of complex numbers is uncountable.
Cantor's diagonal argument and the concept of countability in mathematics. Understanding the distinction between countable and uncountable sets is fundamental in various branches of mathematics, such as set theory and real analysis.
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how does big spaceship differentiate itself from other firms in the industry? what are the strengths and weaknesses of big spaceship's strategy?
Answers
Big Spaceship is a Brooklyn-based agency that provides creative development, strategy, data analytics, and other services to help large companies reach their target audience and create a stronger brand [1]. They differentiate themselves from other firms in the industry through their niche in the digital advertising field, which makes their product hard to imitate easily .
As for the strengths and weaknesses of Big Spaceship's strategy, a source indicates that it is hard to scale and maintain personal attention, but still wants growth to get more flexibility. The source also mentions that a cap of 75 employees is probably ideal for the company in order to maintain its current operations, but opening a LA office didn't work.
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Which of the following describes a task effectively broken into smaller parts? I. Building a tree house by making a building plan, getting supplies and tools, and creating the base II. Reading a book on programming III. Comparing different walking shoes I only I and II II and III I, II, and III
Answers
The option that best describes a task effectively broken into smaller parts is option I only:
I. Building a tree house by making a building plan, getting supplies and tools, and creating the base.What is a breakdown task?A task can be broken down into a hierarchy of connected activities where the work is divided into general and specialized issues.
In project management and systems engineering, a work-breakdown structure is a deliverable-focused division of a project into more manageable parts.
It is an essential project deliverable that tends to share the team's work into digestible chunks is a work breakdown structure. W
Therefore, The option that best describes a task effectively broken into smaller parts is option I only:
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How many comparisons will be made to find 8 in this list using a linear search?
1, 8, 15, 12, 16, 3, 8, 10
1
2
4
3
Answers
Answer:
4
Explanation:
4
What is the SPECIAL NAME used to describe all the types of drawings which allows three faces to be seen at one time?
Answers
Answer:
3d or 3 dimensional??? I'm not sure but it sounds like it
Answer:
Orthographic projection is a name given to drawings that usually have three views. Often, the three views selected are the top, front, and right side.
hope this helps!
If you want to open the Navigation pane to do a Find, what should you first click on the Home tab? Paragraph, Editing, Styles, or View
Answers
Answer:
You would first click view.
Explanation:
hope this helps
Answer:
editing (b)
Explanation:
Not yet answered Points out of 2.50 P Flag question What is the time complexity of the dynamic programming algorithm for weighted interval scheduling and why? Select one: a. O(n) because all it does in the end is fill in an array of numbers. b. O(n²) because it recursively behaves according to the recurrence equation T(n) = 2T(n/2) + n². c. O(n log n) because it sorts the data first, and that dominates the time complexity. d. All of these are correct. e. None of these are correct.
Answers
The time complexity of the dynamic programming algorithm for weighted interval scheduling is O(n log n) because it involves sorting the data first, which dominates the time complexity. This option (c) is the correct answer.
In the weighted interval scheduling problem, we need to find the maximum-weight subset of intervals that do not overlap. The dynamic programming algorithm solves this problem by breaking it down into subproblems and using memorization to avoid redundant calculations. It sorts the intervals based on their end times, which takes O(n log n) time complexity. Then, it iterates through the sorted intervals and calculates the maximum weight for each interval by considering the maximum weight of the non-overlapping intervals before it. This step has a time complexity of O(n). Therefore, the overall time complexity is dominated by the sorting step, resulting in O(n log n).
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Sophia wants to purchase and use a mat board that will be the safest option for long-term use. What would likely be the BEST option for her?
A. Installation board
B. velveteen mat board
OC. acid-soaked board
OD. archival rag board
Answers
The most likely best option for Sophia is installation board is Installation board.
What can I use in place of a mat board?An alternative forms of matboard is Scrapbooking papers as it is made up of a wide range of options that one can be able to see at any craft store.
Therefore, the most likely best option for Sophia is installation board is Installation board. as it is the best option.
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Answer:
archival rag board
Explanation:
I just took it and this is the correct answer
why do most operating systems let users make changes
Answers
By these changes you most likely are thinking of the term 'Over Clocking'
Over Clocking is used on most Operating Systems to bring the item your over clocking to the max.
Over Clocking; is mostly used for Crypto mining and gaming.
read and choose the correct option. the airport has large windows. what do the windows allow people to do as they wait for their flight?
Answers
The question asks about the purpose of the large windows in an airport.
The large windows in an airport allow people to do various things as they wait for their flight. They can enjoy the natural light and view of the outside, watch planes take off and land, and people-watch. The windows also provide a sense of openness and spaciousness in the airport.
In conclusion, the large windows in an airport serve multiple purposes, including providing natural light, views, and a sense of openness. They allow people to relax and pass the time while waiting for their flight.
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A trucking company had its HR department set up an online suggestion program, and employees submitted 1500 ideas for improving workers' safety and health. An assistant in the department entered all the responses into a database. What additional step would be most important to add to this safety program
Answers
An additional step that would be most important to add to this safety program is: working with management to ensure the company acts on the suggestions.
What is a safety program?A safety program can be defined as the development, documentation, implementation and integration of actionable plans, procedures and checklists to generally prevent incidents and occupational (work-related) hazards.
This ultimately implies that, a safety program is developed and implemented so as to make work environments safer by preventing accidents any type of mishap such as:
Fire hazardElectrocutionFloodIn conclusion, it is very important that workers are familiar with safety programs (procedures) to be followed within a company and they should work in collaboration with management to ensure that additional steps and suggestions are acted upon.
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3.19 lab: convert from seconds people find it easier to read time in hours, minutes, and seconds rather than just seconds. write a program that reads in seconds as input, and outputs the time in hours, minutes, and seconds. ex: if the input is: 4000 the output is: hours: 1 minutes: 6 seconds: 40
Answers
Calculate the seconds, subtract the corresponding seconds in hours and minutes you previously found, the remaining is the seconds you have
Print the hours, minutes, and seconds
seconds = int(input("Enter time in seconds: "))
hours = int(seconds / 3600)
minutes = int((seconds - (hours * 3600)) / 60)
seconds = seconds - ((hours * 3600) + (minutes * 60))
print("{} hour(s) {} minute(s) {} second(s)".format(hours, minutes, seconds))
*The code is in Python.
Ask the user to enter the time in seconds
Calculate the hours, divide the seconds by 3600 and cast it to the integer
Calculate the minutes, subtract the corresponding seconds in hours you previously found, divide it by 60 and cast the result to the integer
Calculate the seconds, subtract the corresponding seconds in hours and minutes you previously found, the remaining is the seconds you have
Print the hours, minutes, and seconds
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Juanita lists expenses in a pivottable field named expenses. She wants to filter the pivottable to display data only for expenses greater than $1,000. What type of filter should she use?
Answers
Juanita should use to filter Value on the PivotTable to display data only for expenses greater than $1,000.
In PivotTable use the following steps:
Select Greater Than under Row Label Filter > Value Filters.
Choose the values you want to use as filters in the Value Filter dialogue box. It is the expense in this instance (if you have more items in the values area, the drop-down would show all of it). Choose the circumstance.
Then, Press OK.
Now, choose the values you want to apply as filters. It is the expense in this instance (if you have more items in the values area, the drop-down would show all of it).
• Choose the circumstance. Select "is larger than" because we want to find every expense with more than $1000 .
• Fill out the last field with 1000.
In an instant, the list would be filtered and only display expenses with more than 1000.
Similar to this, you can use a variety of different conditions, including equal to, does not equal to, less than, between, etc.
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a(n) ______ account allows customers to pay with paper ""tickets"" or electronic transfers drawn directly from the account.
Answers
A "checking" account allows customers to pay with paper "tickets" or electronic transfers drawn directly from the account.
A "checking" account allows customers to pay with paper "tickets" or electronic transfers drawn directly from the account. Checking accounts are commonly provided by banks and financial institutions, offering individuals a convenient way to manage their day-to-day financial transactions. With a checking account, customers can write paper checks or use electronic methods such as online bill payments, debit cards, or electronic fund transfers to make payments. Paper "tickets" refer to physical checks that can be filled out and signed by the account holder, while electronic transfers involve the electronic movement of funds between accounts. Checking accounts provide flexibility and accessibility for making payments and managing personal finances efficiently.
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WILL GIVE BRAINLIEST!!
How do you think technology will aid in this year’s presidential election?
Do you think robots will replace humans in the workforce?
How does technology affect business and why?
Answers
Answer:
1) Since Corona is around, tech will have a huge aid on this year's presidential election. Only downside is that, technology can be easily hacked and someone could cheat in the election.
2) Robots will most likely replace humans in the workforce. But, if robots happen to replace humans, there will be less jobs and more poverty.
3) First and foremost, technology affects a firm's ability to communicate with customers. When customers use technology to interact with a business, the business benefits because better communication creates a stronger public image. But a negative impact of technology on business communication is that it can regularly reduce interpersonal relationships in an office. A lack of a collaborative environment can have an impact on teams.
Explanation:
what's your opinion on Pokemon and pixeldip
Answers
Answer:
Its a good game but an amazing show. 10/10
Explanation:
A program is designed to output a subset of {1, 2, 3, 4, 5} randomly. What is the minimum number of times this program must be executed to guarantee that one subset is outputted twice
Answers
The total number of possible subsets of {1, 2, 3, 4, 5} is 2^5 = 32. Therefore, the minimum number of times the program must be executed to guarantee that one subset is outputted twice is 33 times. This is because on the 33rd execution, all possible subsets will have been outputted, and by the Pigeonhole Principle, at least one subset must have been outputted twice.
The Pigeonhole Principle states that if n items are put into m containers, with n > m, then at least one container must contain more than one item. In this case, there are 31 possible subsets, and if we output subsets randomly, there is no way to guarantee that any two subsets will be the same. Therefore, we need to output at least 32 subsets to guarantee that one subset is outputted twice. Therefore, the minimum number of times the program must be executed to guarantee that one subset is outputted twice is 33 times.
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Help please!!
Calculate a student's weight (70 kg) on Earth using the Universal Gravitational Law
Calculate a student's weight (70 kg) on Mercury using the Universal Gravitational Law
Calculate a student's weight (70 kg) on the Sun using the Universal Gravitational Law
Answers
Answer:
1) The student's weight on Earth is approximately 687.398 N
2) The student's weight on Mercury is approximately 257.85 N
3) The student's weight on the Sun is approximately 19,164.428 N
Explanation:
The mass of the student, m = 70 kg
1) The mass of the Earth, M = 5.972 × 10²⁴ kg
The radius of the Earth, R = 6,371 km = 6.371 × 10⁶ m
The universal gravitational constant, G = 6.67430 × 10⁻¹¹ N·m²/kg²
Mathematically, the universal gravitational law is given as follows;
\(F_g =G \times \dfrac{M \cdot m}{R^{2}}\)
Therefore, we have;
\(F_g=6.67430 \times 10^{-11} \times \dfrac{5.972 \times 10^{24} \cdot 70}{(6.371 \times 10^6)^{2}} \approx 687.398\)
\(F_g\) = W ≈ 687.398 N
The student's weight on Earth, W ≈ 687.398 N
2) On Mercury, we have;
The mass of Mercury, M₂ = 3.285 × 10²³ kg
The radius of Mercury, R₂ = 2,439.7 km = 2.4397 × 10⁶ m
The universal gravitational constant, G = 6.67430 × 10⁻¹¹ N·m²/kg²
The universal gravitational law is \(F_g =G \times \dfrac{M_2 \cdot m}{R_2^{2}}\)
Therefore, we have;
\(F_g=6.67430 \times 10^{-11} \times \dfrac{3.285 \times 10^{23} \cdot 70}{(2.4397 \times 10^6)^{2}} \approx 257.85\)
\(F_g\) = W₂ ≈ 257.85 N
The student's weight on Mercury, W₂ ≈ 257.85 N
3) On the Sun, we have;
The mass of the Sun, M₃ ≈ 1.989 × 10³⁰ kg
The radius of the Sun, R₃ ≈ 696,340 km = 6.9634 × 10⁸ m
The universal gravitational constant, G = 6.67430 × 10⁻¹¹ N·m²/kg²
The universal gravitational law is \(F_g =G \times \dfrac{M_3 \cdot m}{R_3^{2}}\)
Therefore, we have;
\(F_g=6.67430 \times 10^{-11} \times \dfrac{1.989 \times 10^{30} \cdot 70}{(6.9634 \times 10^8)^{2}} \approx 19,164.428\)
\(F_g\) = W₃ ≈ 19,164.428 N
The student's weight on the Sun, W₃ ≈ 19,164.428 N
hello everyone! can anybody help me? i need help with computing.
what is a pseucode?
please answer me
Answers
Answer:
a pseu code is a is an artificial and informal language that helps programmers develop algorithms.
Explanation:
The following code should take a number as input, multiply it by 8, and print the result. In line 2 of the code below, the * symbol represents multiplication. Fix the errors so that the code works correctly: input ("Enter a number: ") print (num * 8)
Answers
Answer:
The correct program is as follows:
num = float(input ("Enter a number: "))
print(num * 8)
Explanation:
Notice the difference between (1)
num = float(input ("Enter a number: "))
print (num * 8)
and (2)
input ("Enter a number: ")
print(num * 8)
Program 1 is correct because:
- On line 1, it takes user input in numeric form, unlike (2) which takes it input as string
- On line 2, the program multiplies the user input by 8 and prints it out
Define the term Project brief? why is it important to do planning?
Answers
Answer: the project brief is a document that provides an overview of the project.
Explanation: It says exactly what the designer, architect, and contractor needs to do to exceed your expectations and to keep the project on track with your goals and your budget.
The loop that frequently appears in a program’s mainline logic __________.
a. always depends on whether a variable equals 0
b. is an example of an infinite loop
c. is an unstructured loop
d. works correctly based on the same logic as other loops
Answers
The loop that frequently appears in a program’s mainline logic works correctly based on the same logic as other loops.Loops are constructs in a program that permit the program to execute a block of code repeatedly, depending on the condition in the loop.
In a loop, a statement or a set of statements is executed as long as the loop continues; as soon as the loop condition is false, the loop terminates.A loop that frequently appears in a program's mainline logic works correctly based on the same logic as other loops. In programming, a loop frequently appears in the mainline logic of a program. The purpose of loops is to execute a sequence of statements several times as long as the condition in the loop is true.
A loop is a necessary component of any programming language, which is used to repeat a set of instructions or statements until a specified condition is fulfilled. Loops can be divided into two types: for loops and while loops. Loops are utilized for several tasks, including scanning, formatting, and processing information. Loops are commonly utilized in programming to repeat a certain segment of code or a group of instructions many times.
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