This book constitutes the refereed proceedings of the 7th International Conference on Extending Database Technology, EDBT 2000, held in Constance, Germany, in March 2000. The 30 revised full papers presented in the volume together with an invited paper and six industry and application papers were carefully reviewed and selected from a total of 187 submissions. The papers are organized in topical sections on indexing and searching, mediators and semantic integration, cooperation and security, performance, data warehousing, semi-structured data, data mining, XML applications, spatial and temporal information, systems and applications, and query systems.