1 Database Fundamentals. - Database Principles. - Database Design. - Database Models. - Imprecision in Conventional Databases. - References. - 2 Relational Databases and Fuzzy Sets Background. - Relational Database Concepts. - Fuzzy Set Theory. - References. - 3 Similarity-Based Models. - Basic Fuzzy Databases Approaches. - Similarity-Based Models. - Proximity-Based Models. - Distinguishability Data Model. - Querying Fuzzy Relational Databases. - Fuzzy Functional Dependencies. - Information-Theoretic Measures. - Fuzzy Database Security. - References. - 4 Possibility-Based Models. - Weighted Tuples. - Possibility-Based Fuzzy Relational Databases. - Query Languages. - Related Database Issues. - Implementation Issues. - References. - 5 Alternative Database Models and Approaches. - Entity-Relationship Models. - Network Data Models. - Object-Oriented Models. - Rough Sets Approach. - Geographical Information Systems. - References. - 6 Commerical and Industrial Applications. - Fuzzy Querying Front End Interfaces. - Special Purpose Systems. - Commerically Available Products. - Summary. - References. Language: English