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142
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EDBT
2004
ACM
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EDBT 2004
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Processing Unions of Conjunctive Queries with Negation under Limited Access Patterns
16 years 3 months ago
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We study the problem of answering queries over sources with limited access patterns. The problem is to decide whether a given query Q is feasible, i.e., equivalent to an executable...
Alan Nash, Bertram Ludäscher
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