Introduction To ReactJS

Introduction To ReactJS - JavaScript

React JS Intro

(Image by - Sharma Guides | Subham232330)

What is ReactJS?

* ReactJS is a free and open-source JavaScript library for building user interfaces using a component-based concept.

* ReactJS is also known as React, React Js.

* React is maintained by Facebook.

* ReactJS is not a framework, it is a library.

Examples of ReactJS websites:-

Facebook, Discord, Netflix, Dropbox

Advantages of ReactJS

1. DOM Virtuality

2. Easy Testing

3. SEO Friendly

4. Blazing Fast

5. Efficient Debugging

Prerequisites

HTML

CSS

JavaScript

ES6:- let, const, arrow function, classes, object literals, spread operators.

Comments

DBMS Keys

DBMS Keys KEYS in DBMS is an attribute or set of attributes which helps you to identify a row (tuple) uniquely in a relation(table). They allow you to find the relation between two tables. Keys help you uniquely identify a row in a table by a combination of one or more columns in that table. Key is also helpful for finding unique record or row from the table. Database key is also helpful for finding unique record or row from the table. Example: Employee ID FirstName LastName 11 Andrew Johnson 22 Tom Wood 33 Alex Hale In the above-given example, employee ID is a primary key because it uniquely identifies an employee record. In this table, no other employee can have the same employee ID. Here are some reasons for using sql key in the DBMS system. Keys help you to identify any row of data in a table. In a real-world application, a table could contain thousands of records. Moreover, the records could be duplicated. Keys in RDBMS ensure that you can uniquely identify a table record despite ...

Normalization Types in DBMS

Normalization Types in DBMS First Normal Form (1NF) A relation will be 1NF if it contains an atomic value. It states that an attribute of a table cannot hold multiple values. It must hold only single-valued attribute. First normal form disallows the multi-valued attribute, composite attribute, and their combinations. Example: Relation EMPLOYEE is not in 1NF because of multi-valued attribute EMP_PHONE. EMPLOYEE table: EMP_ID EMP_NAME EMP_PHONE EMP_STATE 14 John 7272826385, 9064738238 UP 20 Harry 8574783832 Bihar 12 Sam 7390372389, 8589830302 Punjab The decomposition of the EMPLOYEE table into 1NF has been shown below: EMP_ID EMP_NAME EMP_PHONE EMP_STATE 14 John 7272826385 UP 14 John 9064738238 UP 20 Harry 8574783832 Bihar 12 Sam 7390372389 Punjab 12 Sam 8589830302 Punjab Second Normal Form (2NF) In the 2NF, relational must be in 1NF. In the second normal form, all non-key attributes are fully functional dependent on the primary key Example: Let's assume, a school can ...

Normalization in DBMS

Normalization A large database defined as a single relation may result in data duplication. This repetition of data may result in: Making relations very large. It isn't easy to maintain and update data as it would involve searching many records in relation. Wastage and poor utilization of disk space and resources. The likelihood of errors and inconsistencies increases. So to handle these problems, we should analyze and decompose the relations with redundant data into smaller, simpler, and well-structured relations that are satisfy desirable properties. Normalization is a process of decomposing the relations into relations with fewer attributes. What is Normalization? Normalization is the process of organizing the data in the database. Normalization is used to minimize the redundancy from a relation or set of relations. It is also used to eliminate undesirable characteristics like Insertion, Update, and Deletion Anomalies. Normalization divides the larger table into smaller and link...

Sharma Guides

Search This Blog