SQL is a standard language used for accessing relational databases. Its major advantages are its straightforward syntax and its efficiency and cost-effectiveness in interrogating databases. This book provides a clear and detailed account of SQL and includes many easy-to-follow examples of SQL usage. Advanced users of SQL will find the section on problem solving especially useful. Full details are provided of the ANSI standard SQL, with an overview of implementations in Oracle, Ingres and dBASE IV.