The book "Standard Relational and Network Database Languages" offers a comprehensive analysis of the development and application of database management systems (DBMS) in the context of information technology. It highlights the theoretical and practical advancements made over the past two decades and illustrates how these advancements have established databases as the preferred solution for designing information systems. The authors, C. P. Cheng and E. J. Yannakoudakis, discuss the relevance of relational and network-based database languages and their implementation by the International Organization for Standardization (ISO). The book is aimed at professionals and students who wish to gain a deeper understanding of the structure and functionality of modern database technologies. It provides valuable insights into the flexibility, efficiency, and user-friendliness of DBMS and their role in the development of knowledge-based systems.