FTSQL2: Fuzzy time in relational databases.
José Á. Galindo, Juan Miguel Medina · 2001
FSQL language is an extension of the SQL language which permits us to write flexible (or fuzzy) conditions in our queries to a fuzzy or traditional database. In this work we present some new fuzzy data types based on time concepts. We extend the existing temporal data types in SQL2 and we give a brief overview of basic definitions in fuzzy temporal databases. In particular, we explain how query operations in TSQL2 language need to be extended for fuzzy temporal querying.