This tutorial is designed for individuals who are new to SQL or have some basic understanding and wish to deepen their knowledge to an intermediate level. We'll cover fundamental SQL concepts, progress to more advanced topics like complex joins, subqueries, and data manipulation, all while using a set of interconnected tables to demonstrate practical applications. 

Target Audience

 Beginners with no prior SQL experience.
 Individuals who have used SQL but want to solidify their understanding of core concepts and explore intermediate features.
 Anyone looking to improve their data querying and manipulation skills.

Prerequisites

 No prior SQL knowledge is required.
 Basic computer literacy.
 A SQL environment (e.g., MySQL, PostgreSQL, SQL Server, SQLite) to practice the code examples. We'll primarily use standard SQL syntax that should be compatible across most systems.

Learning Objectives

By the end of this tutorial, you will be able to:
 Understand relational database concepts.
 Write basic to intermediate SQL queries for data retrieval.
 Filter, sort, and group data effectively.
 Perform various types of joins to combine data from multiple tables.
 Utilise subqueries for more complex data retrieval.
 Perform data manipulation operations (INSERT, UPDATE, DELETE).
 Understand and apply aggregate functions.
 Work with common SQL functions.
 Create and manage tables.