Closed World Databases Opened Through Null Values
Summary: Locally-controlled open world databases allow opening portions of a closed relational model via null insertions. Three nulls (unknown, does-not-exist, open) with formal semantics and extended operators enable open-world reasoning; notes ongoing work and open problems. (summarized by gpt-5-nano on Feb 09 2026)
Incoming Non-self Citations Over Time
Authors
- 1. Georg Gottlob
- 2. Roberto Zicari
Incoming Citations (Sorted by Pagerank)
Showing 7 of 7 citing papers.
| Rank | Citing Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 523 | Recovering Information from Summary Data | 1997 | VLDB | 0.00021089782 |
| 3,502 | Data Exchange and Incomplete Information | 2006 | PODS | 7.0366655e-05 |
| 4,466 | Data Exchange and Schema Mappings in Open and Closed Worlds | 2008 | PODS | 6.1601459e-05 |
| 5,388 | Troubles with Nulls, Views from the Users | 2022 | VLDB | 5.5373113e-05 |
| 5,459 | Capturing Missing Tuples and Missing Values | 2010 | PODS | 5.4957751e-05 |
| 5,460 | Relative Information Completeness | 2009 | PODS | 5.4957751e-05 |
| 11,069 | Hardware-Efficient Data Imputation through DBMS Extensibility | 2024 | VLDB | 4.1945683e-05 |
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Outgoing Citations (Sorted by Pagerank)
Showing 7 of 7 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 8 | Extending the Data Base Relational Model to Capture More Meaning | 1979 | SIGMOD | 0.0015385917 |
| 272 | A DBMS Prototype to Support Extended NF2 Relations: An Integrated View on Flat Tables and Hierarchies | 1986 | SIGMOD | 0.00029426313 |
| 384 | Data Structures for an Integrated Data Base Management and Information Retrieval System | 1982 | VLDB | 0.00024797165 |
| 422 | Non First Normal Form Relations To Represent Hierarchically Organized Data | 1984 | PODS | 0.00023677809 |
| 528 | Database Relations with Null Values (Extended Abstract) | 1982 | PODS | 0.0002084153 |
| 963 | Null Values in Data Base Management: A Denotational Semantics Approach | 1979 | SIGMOD | 0.00014980053 |
| 2,744 | Determining When A Structure Is A Nested Relation | 1985 | VLDB | 8.1896577e-05 |
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Semantically Similar Papers
| Overall Rank | Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 3,502 | Data Exchange and Incomplete Information | 2006 | PODS | 7.0366655e-05 |
| 6,858 | When is Naive Evaluation Possible? | 2013 | PODS | 4.9060157e-05 |
| 12,946 | A Family of Incomplete Relational Database Models | 1989 | VLDB | 4.1945683e-05 |
| 2,769 | On The Integrity Of Databases With Incomplete Information | 1986 | PODS | 8.1450304e-05 |
| 5,388 | Troubles with Nulls, Views from the Users | 2022 | VLDB | 5.5373113e-05 |
| 5,459 | Capturing Missing Tuples and Missing Values | 2010 | PODS | 5.4957751e-05 |
| 12,957 | A Sound and Complete Query Evaluation Algorithm for Relational Databases with Null Values | 1988 | SIGMOD | 4.1945683e-05 |
| 4,759 | On Relational Algebra With Marked Nulls | 1984 | PODS | 5.9416104e-05 |
| 963 | Null Values in Data Base Management: A Denotational Semantics Approach | 1979 | SIGMOD | 0.00014980053 |
| 528 | Database Relations with Null Values (Extended Abstract) | 1982 | PODS | 0.0002084153 |