A multi-set relational algebra in view of universal query language

Authors:
Piotr Wiśniewski
Affiliations:
Faculty of Mathematics and Computer Science, Nicolaus Copernicus University, Toruń, Poland
Venue:
FGIT'12 Proceedings of the 4th international conference on Future Generation Information Technology
Year:
2012

Citing 2
Cited 1

A relational model of data for large shared data banks

Communications of the ACM
A Multi-Set Extended Relational Algebra - A Formal Approach to a Practical Issue

Proceedings of the Tenth International Conference on Data Engineering

Universal Query Language for Unified State Model

Fundamenta Informaticae - Dedicated to the Memory of Professor Manfred Kudlek

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Abstract

The Unified State Model (USM) is a single model that allowed conveying objects of popular programming languages and databases. The USM model exploits and emphase common properties of all objects. The mapping between popular data models and USM has been already shown. In consequence the Universal Query Language (UQL) has been proposed as a set of base operators. UQL pretends to cover most popular query languages and construction of USM and base operators of the UQL has been performed. Examples of simple SQL queries expressed via UQL has been already demonstrated. In this paper we present how operators of a multi-set extended relational algebra can be expressed by UQL operators.