#databases

Database Introduction

Every application you use — from social media to banking to the notes app on your phone — stores data somewhere. That somewhere is a database. A database is an organized collection of data that software can efficiently read, write, and query. Understanding how databases work is a foundational skill for any developer, regardless of what you’re building. In this tutorial, we’ll cover what databases are, why they exist, the major types you’ll encounter, and how to think about choosing one. Read more →

April 14, 2026

SQL Joins

In the SQL Basics tutorial, we worked with a single table at a time. But real databases almost always have multiple related tables — customers and orders, students and courses, products and categories. Joins are how you combine rows from two or more tables based on a related column. Understanding joins is one of the most important SQL skills you can have. They come up constantly in application development, data analysis, and technical interviews. Read more →

April 3, 2026

SQL Basics

Introduction SQL (Structured Query Language) is the standard language for interacting with relational databases. Whether you’re building a web application, analyzing data, or preparing for a technical interview, SQL is a skill you’ll use constantly. It lets you create tables, insert data, query records, update values, and delete rows — all with a readable, declarative syntax.  SQL is pronounced either “sequel” or “S-Q-L” — both are widely accepted. The language has been around since the 1970s and remains the most widely used database language in the world. Read more →

April 3, 2026

Databases

Learn database fundamentals from the ground up. Master SQL, explore NoSQL, and understand how data is stored, queried, and managed in modern applications. Read more →

April 3, 2026