A ____ appearing in the main text of a document indicates a footnote or endnote.

Which key retains its uniqueness even after you remove some of the fields?

Answer:

Primary key retains its uniqueness even after you remove some of the fields.

Explanation:

I am assuming that this question is related to database. Therefore, I am answering it according to database context.

In database, you can have multiple rows and columns. Each column shows a specific attribute while each row plots the data according to the attributes. However, there is the first column of each of main table that has unique set of values. It is called the Primary Key. Some key features of primary key are:

It always contains the unique value.
Its value cannot be null.
A table can have at max one primary key.
It can be the combination of multiple columns but it must be unique.

Therefore, the primary key has the ability to retain its uniqueness even after you remove some of the fields.

8 0

4 years ago

When is the following expression true? (2 points)

ipn [44]

Answer:

1) If and only if a and b have different values

Explanation:

Given

Expression: !(!a || b) || (!a && b)

Required

When is it true?

The expression is true when the values a and b are different and the proof is as follows.

(1) Assume that: a = true and b = false

!(!a || b) || (!a && b)

= !(!true || false) || (!true && false)

!true = false, so the expression becomes:

= !(false|| false) || (false && false)

In boolean, false|| false = false and false && false = false. So, we have:

= !(false) || (false)

!(false) = true, so, the expression becomes:

= true || (false)

Lastly, true || false = true

(2) Assume that: a = false and b = true

!(!a || b) || (!a && b)

= !(!false|| true) || (!false && true)

!false = true, so the expression becomes:

= !(true|| true) || (true && true)

In boolean, true|| true = true and true && true = true. So, we have:

= !(true) || (true)

!(true) = false, so, the expression becomes:

= false|| true

Lastly, false || true = true

<em>This expression is false if a and b have the same value</em>

4 0

3 years ago

Write down the pseudo code for a brute-force algorithm to compare elements in array A with elements in array B.

Thepotemich [5.8K]

Answer:

def brute_force(array1, array2):

for item in array1:

for element in array 2:

if element == item:

print(f"{element} and {item} are a match")

Explanation:

A brute-force algorithm is a direct-to-solution algorithm that searches and compares variables. It is like trying to unlock a safe but not knowing its four-digit combination, brute-force starts from 0000 through 9999 to get a match.

The python program implements the algorithm using two nested for loops. The first loop iterates over array1 while the second, over array2. For every item in the first array, the program loops through the length of the second array. For every match, the items are printed on the screen.

5 0

3 years ago

Which of the following best describes the infrastructure ISPs provide?

svet-max [94.6K]

Answer:

cables, towers, and underground tubes

Explanation:

Its certainly the above one, and through this internet service is being provided. So internet service is self-understood, and what ISP firstly provides are cables, underground tubes, and the towers. And it is only these all through which the ISP provides internet service. And remember we are in this question dealing with the infrastructure and not the services or products. Hence, phone service, websites, and files, as well as the emails, search engines, and the videos, are not the solution here as they are not the infrastructure. And ISPs never provide the computers, ethernet cables or keyboards.

Hence, the correct answer is as mentioned in the answer section.

4 0

4 years ago

Fields where computers are used include: business, education, banking, government, true or false

olga2289 [7]

Answer:

True. Most businesses use computers, including all 4 mentioned in your questions.

7 0

3 years ago