How to Implement FSQL and Priority Queries
نویسندگان
چکیده
Intelligent databases are a developing field since the early nineties. Using fuzzy numbers to model imprecise information is a well-known concept. In this paper, we will show how to implement FSQL queries that can also handle priority. FSQL is actually a superset of SQL, thus queries that deal with fuzzy values need to be pre and post processed. We will only sketch some technical aspects of the on-going implementation process.
منابع مشابه
FTSQL2: Fuzzy time in relational databases
2 Fuzzy Database with FSQL 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 parti...
متن کاملApplying fuzzy databases and FSQL to the management of rural accommodation
Database management systems used in information systems for the tourism industry and based on SQL are flexible insofar as they allow queries regarding the data stored in them. However, the SQL language, in spite of its flexibility, cannot deal with the vagueness of the queries clients present to travel agencies. Questions like ‘‘I want an inexpensive trip to an Italian city not too far from Rom...
متن کاملManagement of an estate agency allowing fuzzy data and flexible queries
As main result of all our previous work we have now available a FSQL Server for Oracle Databases pro grammed in PL SQL This server allows us to query either a Fuzzy or Classic Relational Database with the FSQL language Fuzzy SQL The FSQL language is an extension of the SQL language which permits us to write exible or fuzzy conditions in our queries to a fuzzy or traditional database In this wor...
متن کاملNew architecture of fuzzy database management systems
Fuzzy relational data bases have been extensively studied in a theoretical level. Unfortunately, the repercussions of these works on the practical plan are negligible. Medina et al. have developed a server named fuzzy SQL, supporting flexible queries and based on a theoretic model called GEFRED. This server has been programmed in PL/SQL language under Oracle database management systems. To mode...
متن کاملEnriching Vague Queries by Type-2 Fuzzy Orderings
Structural Query Language (SQL) is very restrictive and very dominant tool that handles data that is crisp and precise in nature; but it is unable to fulfill the needs for data which is uncertain, imprecise, and vague in nature. The human queries are rarely crisp, which need unusual requirements to deal with it based on world knowledge. These requirements are called Fuzzy Queries (FQ) that real...
متن کامل