ESQL: a query language for the relation model supporting image domains

Author

Ahad, Rafiul ; Basu, Amit

Author_Institution

Hewlett-Packard, Cupertino, CA, USA

fYear

1991

fDate

8-12 Apr 1991

Firstpage

550

Lastpage

559

Abstract

It is shown that by simply extending the relational data model to support image domains, the model becomes rich enough for many advanced applications. Extensions to the relational algebra and the relational calculus are developed to exploit the semantics of image domains. The extended calculus is incorporated in the query language ESQL, which is a strict superset of the structured query language (SQL). A technique to implement ESQL using a preprocessor to SQL is shown. A noteworthy observation is that it is possible to incorporate multirelations without any modifications to the storage structures and data definition language of SQL. It is also possible to support queries of multirelations in ESQL without modifying the features of SQL in any way as far as traditional data manipulation is concerned

Keywords

query languages; relational databases; ESQL; data manipulation; image domains; query language; relation model; relational algebra; relational calculus; structured query language; Algebra; Calculus; Data engineering; Data models; Database languages; Design engineering; Image databases; Knowledge engineering; Relational databases; Terminology;

fLanguage

English

Publisher

ieee

Conference_Titel

Data Engineering, 1991. Proceedings. Seventh International Conference on

Conference_Location

Kobe

Print_ISBN

0-8186-2138-9

Type

conf

DOI

10.1109/ICDE.1991.131504

Filename

131504