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Approximate String Joins in a Database (Almost) for Free

Summary: Proposes approximate string joins on commercial DBs via q-grams; encodes match positions and counts, rewriting the predicate as a relational expression. Shows gains vs UDFs for full-string and substring joins; validated on real data and a prototype. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID
8964
Venue
VLDB
Year
2001
Pagerank
0.00033511706
Overall Rank
107 | 99.27%
DOI
-

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@article{gravano_vldb01,
        title = {{Approximate String Joins in a Database (Almost) for Free}},
        author = {Gravano, Luis and Ipeirotis, Panagiotis G. and Jagadish, H. V. and Koudas, Nick and Muthukrishnan, S. and Srivastava, Divesh},
        journal = {PVLDB},
        series = {{VLDB} '01},
        year = {2001}
}

Incoming Citations (Sorted by Pagerank)

Showing 50 of 77 citing papers.

Rank Citing Paper Year Venue Pagerank
158 Robust and Efficient Fuzzy Match for Online Data Cleaning 2003 SIGMOD 0.00028199923
169 Efficient Exact Set-Similarity Joins 2006 VLDB 0.0002743469
200 Efficient set joins on similarity predicates 2004 SIGMOD 0.00025597287
201 Declarative Data Cleaning: Language, Model, and Algorithms 2001 VLDB 0.00025558602
221 Robust and Fast Similarity Search for Moving Object Trajectories 2005 SIGMOD 0.00024224879
306 Eliminating Fuzzy Duplicates in Data Warehouses 2002 VLDB 0.00021839661
356 Efficient Parallel Set-Similarity Joins Using MapReduce 2010 SIGMOD 0.00020303289
432 Mining Database Structure; Or, How to Build a Data Quality Browser 2002 SIGMOD 0.00018572055
528 On Active Learning of Record Matching Packages 2010 SIGMOD 0.00017100838
911 Ed-Join: An Efficient Algorithm for Similarity Joins With Edit Distance Constraints 2008 VLDB 0.00013283031
975 Can We Beat the Prefix Filtering? An Adaptive Framework for Similarity Join and Search 2012 SIGMOD 0.00012870645
1,040 VGRAM: Improving Performance of Approximate Queries on String Collections Using Variable-Length Grams 2007 VLDB 0.00012466499
1,560 Example-driven Design of Efficient Record Matching Queries 2007 VLDB 0.00010361222
1,701 Extending Autocompletion To Tolerate Errors 2009 SIGMOD 9.9707165e-05
1,728 Structured Querying of Web Text: A Technical Challenge 2007 CIDR 9.9098087e-05
1,886 Pass-Join: A Partition-based Method for Similarity Joins 2012 VLDB 9.5358137e-05
2,036 Bed-Tree: An All-Purpose Index Structure for String Similarity Search Based on Edit Distance 2010 SIGMOD 9.2782094e-05
2,103 Cost-Based Variable-Length-Gram Selection for String Collections to Support Approximate Queries Efficiently 2008 SIGMOD 9.1621686e-05
2,120 Comparative Analysis of Approximate Blocking Techniques for Entity Resolution 2016 VLDB 9.1406654e-05
2,186 String Similarity Joins: An Experimental Evaluation 2014 VLDB 9.0001436e-05
2,290 ZeroER: Entity Resolution using Zero Labeled Examples 2020 SIGMOD 8.799251e-05
2,308 Hashed Samples: Selectivity Estimators For Set Similarity Selection Queries 2008 VLDB 8.7738996e-05
2,699 Approximate XML Joins 2002 SIGMOD 8.2433011e-05
2,899 Extending Q-Grams to Estimate Selectivity of String Matching with Low Edit Distance 2007 VLDB 7.97814e-05
3,041 Spatio-Textual Similarity Joins 2013 VLDB 7.8254399e-05
3,047 Similarity Evaluation on Tree-structured Data 2005 SIGMOD 7.8155543e-05
3,193 Efficient Exact Edit Similarity Query Processing with the Asymmetric Signature Scheme 2011 SIGMOD 7.649474e-05
3,356 Benchmarking Declarative Approximate Selection Predicates 2007 SIGMOD 7.490881e-05
3,442 An Efficient Filter for Approximate Membership Checking 2008 SIGMOD 7.4122197e-05
3,446 Efficient Approximate Entity Extraction with Edit Distance Constraints 2009 SIGMOD 7.4087786e-05
3,610 Merging the Results of Approximate Match Operations 2004 VLDB 7.2593873e-05
3,665 BLAST: a Loosely Schema-aware Meta-blocking Approach for Entity Resolution 2016 VLDB 7.2142217e-05
3,731 Trie-Join: Efficient Trie-based String Similarity Joins with Edit-Distance Constraints 2010 VLDB 7.1663952e-05
4,023 Smurf: Self-Service String Matching Using Random Forests 2019 VLDB 6.949387e-05
4,035 Selectivity Estimation for Fuzzy String Predicates in Large Data Sets 2005 VLDB 6.9439151e-05
4,359 Incremental Maintenance of Length Normalized Indexes for Approximate String Matching 2009 SIGMOD 6.7451753e-05
4,396 Approximate String Joins with Abbreviations 2018 VLDB 6.7268636e-05
4,566 Approximate Matching of Hierarchical Data Using pq-Grams 2005 VLDB 6.6275286e-05
4,743 Probabilistic String Similarity Joins 2010 SIGMOD 6.5268783e-05
4,938 Supervised Meta-blocking 2014 VLDB 6.4338718e-05
4,940 BEER: Blocking for Effective Entity Resolution 2021 SIGMOD 6.4336209e-05
4,984 SEAL: Spatio-Textual Similarity Search 2012 VLDB 6.412239e-05
5,018 Schema-agnostic vs Schema-based Configurations for Blocking Methods on Homogeneous Data 2016 VLDB 6.3993079e-05
5,071 Fast Subtrajectory Similarity Search in Road Networks under Weighted Edit Distance Constraints 2020 VLDB 6.3761034e-05
5,088 String Similarity Measures and Joins with Synonyms 2013 SIGMOD 6.3673276e-05
5,306 On Indexing Error-Tolerant Set Containment 2010 SIGMOD 6.2731936e-05
5,344 Discovering Related Data At Scale 2021 VLDB 6.2591104e-05
5,412 Faerie: Efficient Filtering Algorithms for Approximate Dictionary-based Entity Extraction 2011 SIGMOD 6.2272563e-05
5,667 Efficient Approximate Search on String Collections (Tutorial) 2009 VLDB 6.1279762e-05
5,726 Pigeonring: A Principle for Faster Thresholded Similarity Search 2019 VLDB 6.1079184e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 4 of 4 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank Cited Paper Year Venue Pagerank
160 Integration of Heterogeneous Databases Without Common Domains Using Queries Based on Textual Similarity 1998 SIGMOD 0.0002802209
210 An Evaluation of Non-Equijoin Algorithms 1991 VLDB 0.00024797689
592 Distance-Based Indexing For High-Dimensional Metric Spaces 1997 SIGMOD 0.00016029789
784 Near Neighbor Search in Large Metric Spaces 1995 VLDB 0.00014069958
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# Overall Rank Paper Year Venue
1 3,610 Merging the Results of Approximate Match Operations 2004 VLDB
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