Incomplete Information in Relational Databases
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In this paper, the results obtained thus far in an ongoing research effort devoted to the modeling of indefinite information is presented. Specifically, an extended relational model coined E-tables for representing exclusive indefinite type model coined information is described. The semantic, or information content, of E-tables is precisely defined. Both syntactic and semantic definitions of the extended relational algebra operators of selection, projection, and Cartesian product are defined to deal with E-tables. Redundancies that might occur in E-tables are identified. Furthermore, relationships among E-tables, the Generalized Closed World Assumptions, and negations are explored.