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Li-Fi vs Wi-Fi: A Battle of Light and Waves

Li-Fi vs Wi-Fi: A Battle of Light and Waves Li-fi is a light fidelity device that supports only the infrared and other lighting systems to transfer the data to the device which is used to receive from the sender device. Wifi is a wireless fidelity device that supports the radio waves to transfer the data to the wifi device which is used to receive the wifi signals at the limited ranges due to the device version capacity. Introduction to the computer system and computer applications related topics are listed following below here: Li-Fi vs Wi-Fi: A Battle of Light and Waves Let’s discuss the computer system related topic and questions above listed and their answers are following below here: Li-Fi vs Wi-Fi: A Battle of Light and Waves There are some points on the computer system and data communication related to the topic of “Li-Fi vs Wi-Fi: A Battle of Light and Waves” following below here: Lifi based data communication system:- Li-Fi is a light based signal data transmission ...
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What do you mean by the "Mapping" of the database structure in DBMS?

What is “Mapping” in the DBMS?

Mapping in DBMS {Database Management System}

The mapping is a link or connect and equality to describe between view level, conceptual level and internal level.

It used to describe how they are connecting to each other in three levels.

It is a process to convert a request of external level which is request both the two level such as logical level and physical level.

Simply it is a map of Database structure which shows the links of the three levels basically.

There are two types of mapping in DBMS.

  • External conceptual mapping
  • Internal conceptual mapping
In the DBMS each users refers only its own external schema. Hence the DBMS must transform a request on a particular or specified external into the request against to the conceptual schema which means logical level of schema in the logical refers where the logical term has perform in the database and then into the request against internal schema which means the internal is schema in the physical level where the physical structure has their connectivity of the database to computer system or any hardware connectivity show in the physical level store and retrieve data to the database and from the database.

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