Querying Weak Instances
Summary: Defines "weak instances": all universal relations that extend incomplete base relations and satisfy dependencies, with certain answers as the intersection across these instances (relaxing the pure universal assumption). Proposes building a finite representative by padding tuples with distinct nulls and chasing total dependencies to evaluate monotonic queries correctly, and analyzes chase inconsistency and limits of projection-based methods. (summarized by gpt-5-mini on Feb 09 2026)
Incoming Non-self Citations Over Time
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Incoming Citations (Sorted by Pagerank)
Showing 1 of 1 citing papers.
| Rank | Citing Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 6,168 | Optimal Computation of Total Projections with Unions of Simple Chase Join Expressions | 1984 | SIGMOD | 5.1716335e-05 |
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Outgoing Citations (Sorted by Pagerank)
Showing 5 of 5 cited papers.
Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.
| Rank | Cited Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 38 | Testing Implications Of Data Dependencies | 1979 | SIGMOD | 0.00075110004 |
| 58 | Efficient Optimization of a Class of Relational Expressions | 1978 | SIGMOD | 0.00064826446 |
| 135 | Can We Use The Universal Instance Assumption Without Using Nulls? | 1981 | SIGMOD | 0.00042421957 |
| 920 | The U. R. Strikes Back | 1982 | PODS | 0.00015338004 |
| 1,937 | Windows On The World | 1983 | SIGMOD | 0.00010029315 |
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Semantically Similar Papers
| Overall Rank | Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 3,332 | A Universal Relation Database System Implemented Via the Network Model | 1982 | PODS | 7.2123658e-05 |
| 1,062 | Assumptions in Relational Database Theory | 1982 | PODS | 0.00014366096 |
| 3,496 | Dependency Satisfaction in Databases with Incomplete Information | 1984 | VLDB | 7.0397186e-05 |
| 3,559 | Incomplete Information and Dependencies in Relational Databases | 1983 | SIGMOD | 6.9759696e-05 |
| 458 | Independent Database Schemas (Extended Abstract) | 1982 | PODS | 0.00022657396 |
| 8,954 | Understanding Queries by Conditional Instances | 2022 | SIGMOD | 4.4221863e-05 |
| 2,318 | Efficient Query Answering in the Representative Instance Approach | 1985 | PODS | 9.0400919e-05 |
| 12,926 | Efficient Updates to Independent Schemes in the Weak Instance Model | 1990 | SIGMOD | 4.1945683e-05 |
| 135 | Can We Use The Universal Instance Assumption Without Using Nulls? | 1981 | SIGMOD | 0.00042421957 |
| 12,975 | A New Basis for the Weak Instance Model | 1987 | PODS | 4.1945683e-05 |