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MongoDb is a Open Source database written in C++.If the load increases, by adding more nodes (such as a computer), the performance can be retained.

The mysql substr() function returns the number of specific characters from a string. The retrieval happens from a particular position of the given string.

The SQL Right Join or simply RIGHT JOIN return all rows from the first table listed after the JOIN keyword , no matter if they have matches in the left table of the JOIN keyword.

The SQL Left Join or simply LEFT JOIN return all rows from the first table listed after the FROM clause or left of JOIN keyword ,no matter if they have matches in the right table of the JOIN keyword.

Speaking in London, WikiLeaks founder Julian Assange said more than 150 organisations worldwide were selling information obtained by monitoring people's mobile phones and computers.

An SQL JOIN clause combines rows from two or more tables. It creates a set of rows in a temporary table.
A JOIN works on two or more tables if they have at least one common field and have a relationship between them.
JOIN keeps the base tables (structure and data) unchanged.

This document gives you an overview of PostgreSQL and lists what you will learn in the following documents of w3resource PostgreSQL tutorial.

This document covers structure of a C program in the light of a small C program. It includes Comments, #include directive, main() function and Output using printf.

A comprehensive online web development tutorial.

This tutorial teaches you how to work with Firebug. It covers how to inspect and edit HTML with Firebug, how to inspect and edit CSS with Firebug, how to debug and profile JavaScript with Firebug, how to execute JavaScript on the fly with Firebug, how to Log for JavaScript with Firebug, how to monitor network activity with Firebug.