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joja [24]
2 years ago
12

Why do relational databases use primary keys and foreign keys?.

Computers and Technology
1 answer:
Andrew [12]2 years ago
8 0

Answer:

Explanation:

A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.

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File-sharing programs such as Napster, Kazaa, and iMesh make it possible for individuals to exchange music files over the Intern
Mashutka [201]

Answer:

Option A) Demand for CDs has decreased, causing equilibrium price and quantity to decrease.

is the correct answer.

Explanation:

  • File-sharing is a common practice nowadays. It helps us by providing access to different files (audio , video, images, documents) to others in a faster way.
  • A wide range of files are shared daily by using different means of file-sharing including computer networks and peer-to-peer networking.
  • Formerly, the data was shared using CDs but now this system has been replaced with the advent of internet.
  • Usage of CDs is dropped drastically and hence their demand is decreased.
  • So now the prices of CDs are not in equilibrium and their quantity is also decreased.

i hope it will help you!

3 0
3 years ago
Ninety-two percent of the new information was stored on magnetic media, mostly in _____.
kiruha [24]

Answer:

The answer to the following question is the option "b".

Explanation:

In the computer system, Hard disks stand for the hard disk drive. It is also known as a hard disk. It locates inside the computer case. The hard disk drive is used to store an electromechanical data. That uses magnetic storage device that store and retrieve data. So the answer to this question is hard disks.

5 0
3 years ago
the mail merge feature can be used to address the same letter to several different people , true or false
sergij07 [2.7K]
The answer is that it is true.
4 0
3 years ago
Read 2 more answers
A domestic air carrier airplane lands at an intermediate airport at 1815Z. The latest time it may depart without a specific auth
serious [3.7K]

Answer:

A domestic air carrier airplane lands at an intermediate airport at 1815Z. The latest time it may depart without a specific authorization from an aircraft dispatcher is <u>1915Z (1 hour)</u>.

Explanation:

Under the domestic operations, an airplane landed on intermediate airport can remain their for not more than one hour so the time would me 1 hour.

Here the time represented by 1815Z and 1915Z is in Zulu Time Zone as depicted from letter "Z". The first two digits represent the hour (0-24) and the next two represent the minutes (0-59).

  • Here the landing time is 6:15 pm while departing time is after one hour that is 7:15 pm (1915Z).

i hope it will help you.

6 0
3 years ago
Which of the following is a way the operating system prevents unknown or unauthorized users from accessing the system?
Xelga [282]

Put a code or security system on or a very secure password

Hope this helps...

6 0
3 years ago
Read 2 more answers
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