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Publication:3912083
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zbMath0462.68087MaRDI QIDQ3912083

Jeffrey D. Ullman

Publication date: 1981


Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.


zbMATH Keywords

acyclic database schemesnull value semanticsdependency inferencesuniversal relation concept


Mathematics Subject Classification ID

Research exposition (monographs, survey articles) pertaining to computer science (68-02) Information storage and retrieval of data (68P20) Theory of operating systems (68N25)








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