what does a primary key and foreign key relates to? Which drive does a magnet damage...

what does a primary key and foreign key relates to?

Which drive does a magnet damage the most

what the Raid differences ?

what a NIC does

what is NAS and what's it used for and how it can be used in a network setting

which device has a built in antenna

what RF is used for (Radio Frequency )

Expert Solution

1) Primary key and foreign key are the terms which are related to relational database.

We use the concept of primary key when we want to identify each row in the table uniquely.
When there is 1-M relationship it means when we want to store multiple values for same instance, we use the concept of Foreign key. If a column in one table is referencing to a primary key column in another table, then it is called as Foreign key.

2) Magnet mostly damage the HARD DRIVE(HDD) in the system. Due to magnetic field it creates, its erases the data in hard drive. But we need a really powerful magnet to do that.

3) RAID - Redundant Array of Independent/Inexpensive Disks. It is a storage technology in which we combine the disks together to increase efficiency, reliability and performance of data. They are different types of RAID levels based on how they were arranged. Some of them are RAID-0, RAID-1, RAID-5, RAID-6,e.t.c..

4) NIC - Network Interface Controller/Card. It is used to connect a computer to a computer network. This makes the communication to be happened between the computers both wired and wireless.

6) Mobiles, Televisions and so many devices have inbuilt antennas. It means they dont have an external device to receive the digital signals.

7) RF(Radio frequency) are used in many applications like communication, Medicine e.t.c..

venereology answered 1 year ago

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