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 |
|---|---|---|---|---|
| 7,070 | Optimal Computation of Total Projections with Unions of Simple Chase Join Expressions | 1984 | SIGMOD | 4.8380576e-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 | 0.0007528369 |
| 58 | Efficient Optimization of a Class of Relational Expressions | 1978 | SIGMOD | 0.00064817807 |
| 131 | Can We Use The Universal Instance Assumption Without Using Nulls? | 1981 | SIGMOD | 0.00043719033 |
| 924 | The U. R. Strikes Back | 1982 | PODS | 0.00015249498 |
| 1,965 | Windows On The World | 1983 | SIGMOD | 9.9176387e-05 |
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Semantically Similar Papers
| Overall Rank | Paper | Year | Venue | Pagerank |
|---|---|---|---|---|
| 3,339 | A Universal Relation Database System Implemented Via the Network Model | 1982 | PODS | 7.1989217e-05 |
| 1,062 | Assumptions in Relational Database Theory | 1982 | PODS | 0.00014353951 |
| 3,503 | Dependency Satisfaction in Databases with Incomplete Information | 1984 | VLDB | 7.0332465e-05 |
| 3,562 | Incomplete Information and Dependencies in Relational Databases | 1983 | SIGMOD | 6.9690605e-05 |
| 500 | Independent Database Schemas (Extended Abstract) | 1982 | PODS | 0.00021622167 |
| 8,958 | Understanding Queries by Conditional Instances | 2022 | SIGMOD | 4.417947e-05 |
| 2,531 | Efficient Query Answering in the Representative Instance Approach | 1985 | PODS | 8.5916172e-05 |
| 12,936 | Efficient Updates to Independent Schemes in the Weak Instance Model | 1990 | SIGMOD | 4.1905499e-05 |
| 131 | Can We Use The Universal Instance Assumption Without Using Nulls? | 1981 | SIGMOD | 0.00043719033 |
| 12,986 | A New Basis for the Weak Instance Model | 1987 | PODS | 4.1905499e-05 |