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Introduction of JavaScript ?

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JavaScript is a high-level scripting language used for implementing complex features on web pages. It allows developers to create dynamically updating content, control multimedia, animate images, and perform a wide range of other tasks. JavaScript runs in web browsers and is essential for many interactive web applications. Node.js is a cross-platform, open-source back-end JavaScript runtime environment. It enables developers to execute JavaScript code outside of a web browser, which makes it useful for writing command-line tools and server-side scripting. Node.js promotes a "JavaScript everywhere" paradigm, making it possible to use the same programming language for both client-side and server-side scripting. To write and run JavaScript code, you can use an online coding platform such as Replit. In JavaScript, variables are used to store and manipulate data. They can be declared using the var keyword, followed by the variable name and an optional initial value. Multiple varia...

What is SQL Constraints,What is Primary key, What is Foreign key, What is SQL functions ?

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  SQL Constraints, Primary key, Foreign key, SQL functions SQL Constraints SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the table. It Prevents invalid data entry into the table. Constraints not null unique primary key foreign key check Note: check constraint will not be supported by MySQL. Note: some constraints we can apply at the column level and some constraints we can apply at the table level. Column Level: where we define the column not null unique primary key Table Level: after defining all the columns foreign key composite key (multi-column primary key) not null a null value is not allowed, that column will be mandatory. unique to that column duplicate values are not allowed. here we can insert null values multiple times. Note: whenever we define a unique constraint on a column then aut...

Interviews Question-:What is Dynamic Programming ? How to Implementing Dynamic Programming in the Code and real life ?

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Dynamic programming is a computational technique used for solving optimization problems by breaking down the problem into smaller subproblems and then combining the solutions to the subproblems to obtain the optimal solution for the original problem. Dynamic programming is widely used in many fields such as computer science, economics, engineering, and operations research. A graphical model is a mathematical representation of a system that consists of nodes and edges. The nodes represent variables or factors, and the edges represent the relationships between them. Graphical models are often used in machine learning, artificial intelligence, and other fields where probabilistic reasoning is required. In the context of dynamic programming, graphical models can be used to represent the structure of the problem and the relationships between the subproblems. The graphical model can help in visualizing the problem and in identifying the optimal substructure that is required for dynamic progr...

Introduction, SQL basics: DDL, DML, DRL || What is SQL ? || What is DDL ? What is DML? What is DRL?

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   Introduction, SQL basics: DDL, DML, DRL Java It is mainly used to develop a business application. Business Application Business organizations : the main objective for any business organization is profit. 1.  Small-scale business organizations (grocery shops, petrol pumps, they are running their services in a limited area.) 2.  Larger scale business organizations(Banks, railways, eCommerce, travel, insurance): these types of Business organizations are also called enterprises. These Business Organizations provide their services to the  client/customers,  and to  computerize those services  whatever application we develop is known as a  Business application. Common and general things in any business application: Storing and maintaining business data in a secure and easily retrievable manner. Processing the business data according to the business rules. Presenting the data to the user, in a user-understandable format. Note:  in real-time ...

All Basic Function and Key Word Related to the SQL(Structured Query Language) on this Blogs

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All Basic Function and Key Word Related to the SQL(Structured Query Language) on this Blogs   Enter password: **** Welcome to the MySQL monitor.  Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.32 MySQL Community Server - GPL Copyright (c) 2000, 2023, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> SHOW DATEBASES; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DATEBASES' at line 1 mysql> SHOW DATABASES; +--------------------+ | Database           | +--------------------+ | borrow             | | deposit            | | information_schema | | my...

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Introduction, SQL basics: DDL, DML, DRL || What is SQL ? || What is DDL ? What is DML? What is DRL?

All Basic Function and Key Word Related to the SQL(Structured Query Language) on this Blogs