Qunits: queried units for database search

Summary: Introduce qunits—independent queried units representing canonical query results, decoupling declarative DB predicate semantics from presentation/aggregation. Keyword search is executed over a corpus of qunits treated as IR documents, enabling standard ranking models instead of ad-hoc DB ranking; prototype validates feasibility. (summarized by gpt-5-mini on Feb 09 2026)

Paper ID: hd576f364ab6ff151
Venue: CIDR
Year: 2009
Pagerank: 5.4518584e-05
Overall Rank: 7,791 | 47.62%
DOI: -

Incoming Non-self Citations Over Time

Authors

1. Arnab Nandi (University of Michigan)
2. H.V. Jagadish (University of Michigan)

BibTeX Citation

@inproceedings{nandi_cidr09,
        address = {Amsterdam, Netherlands},
        series = {{CIDR} '09},
        title = {{Qunits: queried units for database search}},
        booktitle = {Proceedings of the {Conference} on {Innovative} {Data} {Systems} {Research}},
        author = {Nandi, Arnab and Jagadish, H.V.},
        year = {2009}
}

Incoming Citations (Sorted by Pagerank)

Showing 3 of 3 citing papers.

Rank	Citing Paper	Year	Venue	Pagerank
6,331	Generating Preview Tables for Entity Graphs	2016	SIGMOD	5.8121052e-05
6,724	Schema-free SQL	2014	SIGMOD	5.6950798e-05
12,676	Keyword Search on Form Results	2011	VLDB	4.9793485e-05

Outgoing Citations (Sorted by Pagerank)

Showing 16 of 16 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	DISCOVER: Keyword Search in Relational Databases	2002	VLDB	0.00047394041
81	XRANK: Ranked Keyword Search over XML Documents	2003	SIGMOD	0.00036346781
290	ObjectRank: Authority-Based Keyword Search in Databases	2004	VLDB	0.00021955068
293	Bidirectional Expansion For Keyword Search on Graph Databases	2005	VLDB	0.00021943678
303	Proximity Search in Databases	1998	VLDB	0.0002164278
319	Making Database Systems Usable	2007	SIGMOD	0.00021164857
505	Schema-Free XQuery	2004	VLDB	0.00017161757
923	Materialized View Selection and Maintenance Using Multi-Query Optimization	2001	SIGMOD	0.00013064753
1,220	Semantic Adaptation of Schema Mappings when Schemas Evolve	2005	VLDB	0.00011474444
1,311	Assisted Querying using Instant-Response Interfaces	2007	SIGMOD	0.00011065979
1,733	Schema Summarization	2006	VLDB	9.7551427e-05
2,203	Automated Creation of a Forms-based Database Query Interface	2008	VLDB	8.8609567e-05
2,262	Identifying Meaningful Return Information for XML Keyword Search	2007	SIGMOD	8.7333724e-05
4,208	Querying Complex Structured Databases	2007	VLDB	6.7339511e-05
7,769	Predicate-based Indexing of Enterprise Web Applications	2007	CIDR	5.4554766e-05
7,770	Unifying Data and Domain Knowledge Using Virtual Views	2007	VLDB	5.4554766e-05

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#	Overall Rank	Paper	Year	Venue
1	3,312	Keyword Search on Structured and Semi-Structured Data	2009	SIGMOD
2	1,921	QUEST: A Keyword Search System for Relational Data based on Semantic and Machine Learning Techniques	2013	VLDB
3	7,041	NUITS: A Novel User Interface for Efficient Keyword Search over Databases	2006	VLDB
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5	9,098	Toward Scalable Keyword Search over Relational Data	2010	VLDB
6	3,728	Keyword Search over Relational Databases: A Metadata Approach	2011	SIGMOD
7	5,724	Combining Keyword Search and Forms for Ad Hoc Querying of Databases	2009	SIGMOD
8	768	Effective Keyword Search in Relational Databases	2006	SIGMOD
9	217	Efficient IR-Style Keyword Search over Relational Databases	2003	VLDB
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