Introduction to SQL for Data Workers

This SQL tutorial provides a comprehensive introduction to Structured Query Language, which is a critical tool for managing data in databases. The article starts with basic concepts, such as database structure and different types of databases, and then moves to more advanced topics like writing queries, data manipulation, and performance optimization. Key aspects, including the differences between SQL and NoSQL, are also discussed, allowing readers to understand when and why they can be used. It guides users step by step through the process of creating a database, defining tables, and inserting and modifying data. At the end of the tutorial, there are practical examples of SQL applications, making it an excellent resource for both beginners and more advanced users.