The Conjunctive Information in Disjunctive Databases

J. Wijsen

Review of Business and Economic Literature, 2005, vol. L, issue 4, 611-624

Abstract: OR-sets and marked null values are two ways of representing incomplete information in relational databases. Existing relational database systems do not support OR-sets, but can be easily extended to support marked null values. We show that relations with OR-sets can be transformed into relations with marked null values without changing the answers to conjunctive queries.

Date: 2005
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Persistent link: https://EconPapers.repec.org/RePEc:ete:revbec:20050406

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