Understanding, applying, and developing databases in practical (professional) everyday life. Relational databases and the query language SQL. A quick yet solid overview with references to further literature, examples, and exercises. Databases have become an indispensable part of information systems in general, and especially of web-based systems. This book imparts the necessary knowledge for understanding and developing such systems in the areas of data modeling, database design, and SQL in a compact form. It describes practical use within the framework of application development, particularly in the creation of database-driven web applications. The book is primarily aimed at readers who want to gain a quick yet thorough overview of the development and use of databases.