Discussion of Category Model of Relational
Algebra in Relational Database

DU Ya-jun; XU Yang

Volume 16 Issue 6

Dec. 2003

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Article Contents

Journal of Southwest Jiaotong University > 2003 > 16(6): 703-707.

DU Ya-jun, XU Yang. Discussion of Category Model of RelationalAlgebra in Relational Database[J]. Journal of Southwest Jiaotong University, 2003, 16(6): 703-707.

Citation:

DU Ya-jun, XU Yang. Discussion of Category Model of Relational Algebra in Relational Database[J]. Journal of Southwest Jiaotong University, 2003, 16(6): 703-707.

DU Ya-jun, XU Yang. Discussion of Category Model of RelationalAlgebra in Relational Database[J]. Journal of Southwest Jiaotong University, 2003, 16(6): 703-707.

Citation:

DU Ya-jun, XU Yang. Discussion of Category Model of Relational Algebra in Relational Database[J]. Journal of Southwest Jiaotong University, 2003, 16(6): 703-707.

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Discussion of Category Model of Relational Algebra in Relational Database

DU Ya-jun,
XU Yang

Publish Date: 25 Dec 2003

Abstract

Abstract

To optimize multi-condition selection and projection operations in a relational database, a category model for relational databases was established based on the category theory and its characters were discussed. On the basis of this model, the connecting laws of selection and projection operations in the equivalent transformation of relational algebra in a relational database were investigated and the functions of the laws were extended.
- relational database,
- relational algebra,
- category model