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2 years ago

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

Computers and Technology

1 answer:

Natasha_Volkova [10]2 years ago

8 0

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.

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A semaphore puts a thread to sleep:

otez555 [7]

Answer:

B. until another thread issues a notify on the semaphore.

Explanation:

A semaphore is a variable that is shared between threads and is not negative. It also acts as a calling mechanism that uses two atomic operations wait and signal for synchronization of processes.

A thread that is waiting for a process can be signaled by another thread.

A semaphore puts a thread to sleep until another thread issues a notify on the semaphore.

The wait operation will get a semaphore or otherwise wait if the busy S semaphore is available.

The signal operation will release a semaphore or wake a process if there is a thread waiting for S.

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2 years ago

Write a script that inputs a line of encrypted text and a distance value and outputs plaintext using a Caesar cipher. The script

jenyasd209 [6]

Answer:

# Request the inputs

codedText = input("Enter the coded text: ")

distance = int(input("Enter the distance value: "))

# Calculate the decryption

# see comment for the rest. Brainly won't let me save an answer which contains code.

Explanation:

Above is your program fixed, but it is unclear on how to deal with unprintable characters, i.e., characters that originally were near the highest printable character ('~')

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2 years ago

Which of the following is not one of the four criteria for evaluating websites?

Flura [38]

Answer:validity

Explanation:

Because it dont sound right

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2 years ago

An ISP is granted the block 16.12.64.0/20. The ISP needs to allocate addresses for 8 organizations, each with 256 addresses. a.

melisa1 [442]

Answer:

I did not understand a thing from your writing

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2 years ago

If you're found to be at fault in _____, your driver license will be canceled within 90 days unless you complete a 12-hour Advan

Viktor [21]

Answer:

D. three crashes within three years.

Explanation:

Rules differ from Country to Country. In United States Of America, the traffic rules are so strict and the process of License is followed strictly and people who are violating rules gets a penalty or punishment in such a way that it changes their mindset to follow the traffic rules strictly.

All these are done to safe guard people, avoid injuries and sudden loss of death due to accidents.

So if a driver has done three crashes within 36 months of time, then the driver license is likely to get cancelled within 90 days.

In order to avoid this it is necessary for the driver to appear for improvement course of driving and appear for the test once again.

5 0

2 years ago

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