INDEFINITE AND MAYBE INFORMATION IN RELATIONAL DATABASES

被引：62

作者：

LIU, KC ^{[1
]}

SUNDERRAMAN, R ^{[1
]}

机构：

[1] WICHITA STATE UNIV,DEPT COMP SCI,WICHITA,KS 67208

来源：

ACM TRANSACTIONS ON DATABASE SYSTEMS | 1990年 / 15卷 / 01期

关键词：

D O I：

10.1145/77643.77644

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

This paper extends the relational model to represent indefinite and maybe kinds of incomplete information. A data structure, called an I-table, which is capable of representing indefinite and maybe facts, is introduced. The information content of I-tables is precisely defined, and an operator to remove redundant facts is presented. The relational algebra is then extended in a semantically correct way to operate on I-tables. Queries are posed in the same way as in conventional relational algebra; however, the user may now expect indefinite as well as maybe answers. © 1990, ACM. All rights reserved.

引用

页码：1 / 39

页数：39

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