The Conjunctive Information in Disjunctive Databases
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.
Volume (Year): L (2005)
Issue (Month): 4 ()
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