Gruber understood that SQL, despite being a standard (ANSI), was being fractured by different database systems. His book focuses on . Whether you eventually use MySQL, PostgreSQL, SQLite, or Microsoft SQL Server, the principles in this book apply.
While programming languages like Python and JavaScript undergo significant syntax changes every few years, SQL (Structured Query Language) has remained remarkably stable. The SQL-92 standard is still the foundation for the SQL used in modern engines like MySQL, PostgreSQL, Microsoft SQL Server, and Oracle. Because Gruber focuses on the standard logic of SQL rather than the specific quirks of one proprietary system, the lessons in his book apply universally. A LEFT JOIN written in 1995 works exactly the same way in 2024. Martin Gruber Understanding Sql.pdf