#sql

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