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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 are the components of data model in [DBMS] Relational Database Management System?

What are the components of data model in [DBMS] Relational Database Management System?

There are five main components of data model in RDBMS

Fields

  • Fields are the attributed of the records.
  • It is also called tuple of the attributes and properties or features.
  • Fields shows the characteristics of the object such as name, age, gender, address etc.
  • It contains also primary attribute or auto number id.

Records

  • Records are tuple or rows in the database.
  • It shows all the data of the object inserted in the rows.
  • It is also collection of the attributes, properties or fields.

Files

  • Files are the collections of the records.
  • It shows the related records in the file data.
  • It is also collections and combinations of the tuples and attributes.

Databases

  • The database is the collection of related files.
  • It is also a group of files which is making relation to each other.

Key field

  • Key fields also called key attribute in the database of relation.
  • There are some key attributes you can apply on the relation database such as primary key, composite key, super key, foreign key, secondary key and candidate key.
  • The record can uniquely identified by the primary key such as auto number id.





Can a strong field in a table or relational database provide uniqueness of a particular record?


In the image diagram shows the coding and table diagram of field which is strong has been mentioned in the table as a primary key


Yes, it is true that the strong field may be a primary key attribute or other key attributed almost total 6 key attributes including primary key on the relational database model to define record is unique to each other.
The user can be defined easily through the key attribute because it includes the unique value to describe the record of the user can easily be found from all records in the table or relational database model.
The key attribute is used to provide the address also to apply the command on the particular record on the table or relational database model.
Key attribute can be in the form of student_id is a field name in the table and the record has a number 1467 is a unique and it cannot be allowed to matched from the other record on the table because it is only follows the sequential numerical value of the key attribute on the relational database model.

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