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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
hee20d4f8857d69bc
Venue
VLDB
Year
2001
Pagerank
0.0003305531
Overall Rank
108 | 99.28%
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 78 citing papers.

Rank Citing Paper Year Venue Pagerank
161 Robust and Efficient Fuzzy Match for Online Data Cleaning 2003 SIGMOD 0.00027718195
168 Efficient Exact Set-Similarity Joins 2006 VLDB 0.00027163517
201 Efficient set joins on similarity predicates 2004 SIGMOD 0.00025331535
204 Declarative Data Cleaning: Language, Model, and Algorithms 2001 VLDB 0.00025190386
227 Robust and Fast Similarity Search for Moving Object Trajectories 2005 SIGMOD 0.0002393284
307 Eliminating Fuzzy Duplicates in Data Warehouses 2002 VLDB 0.00021499031
360 Efficient Parallel Set-Similarity Joins Using MapReduce 2010 SIGMOD 0.00020009936
435 Mining Database Structure; Or, How to Build a Data Quality Browser 2002 SIGMOD 0.0001832766
534 On Active Learning of Record Matching Packages 2010 SIGMOD 0.0001680637
929 Ed-Join: An Efficient Algorithm for Similarity Joins With Edit Distance Constraints 2008 VLDB 0.00013020115
963 Can We Beat the Prefix Filtering? An Adaptive Framework for Similarity Join and Search 2012 SIGMOD 0.00012816649
1,061 VGRAM: Improving Performance of Approximate Queries on String Collections Using Variable-Length Grams 2007 VLDB 0.00012213729
1,581 Example-driven Design of Efficient Record Matching Queries 2007 VLDB 0.00010180038
1,737 Extending Autocompletion To Tolerate Errors 2009 SIGMOD 9.7494976e-05
1,760 Structured Querying of Web Text: A Technical Challenge 2007 CIDR 9.7106555e-05
1,933 Pass-Join: A Partition-based Method for Similarity Joins 2012 VLDB 9.3459285e-05
2,072 Bed-Tree: An All-Purpose Index Structure for String Similarity Search Based on Edit Distance 2010 SIGMOD 9.0864612e-05
2,110 Comparative Analysis of Approximate Blocking Techniques for Entity Resolution 2016 VLDB 9.0233278e-05
2,144 Cost-Based Variable-Length-Gram Selection for String Collections to Support Approximate Queries Efficiently 2008 SIGMOD 8.9608583e-05
2,220 String Similarity Joins: An Experimental Evaluation 2014 VLDB 8.8146984e-05
2,323 ZeroER: Entity Resolution using Zero Labeled Examples 2020 SIGMOD 8.6348884e-05
2,354 Hashed Samples: Selectivity Estimators For Set Similarity Selection Queries 2008 VLDB 8.5896515e-05
2,747 Approximate XML Joins 2002 SIGMOD 8.0614566e-05
2,944 Spatio-Textual Similarity Joins 2013 VLDB 7.828107e-05
2,967 Extending Q-Grams to Estimate Selectivity of String Matching with Low Edit Distance 2007 VLDB 7.8029216e-05
3,108 Similarity Evaluation on Tree-structured Data 2005 SIGMOD 7.640323e-05
3,255 Efficient Exact Edit Similarity Query Processing with the Asymmetric Signature Scheme 2011 SIGMOD 7.4890984e-05
3,403 Benchmarking Declarative Approximate Selection Predicates 2007 SIGMOD 7.3300953e-05
3,501 An Efficient Filter for Approximate Membership Checking 2008 SIGMOD 7.2531528e-05
3,512 Efficient Approximate Entity Extraction with Edit Distance Constraints 2009 SIGMOD 7.2439455e-05
3,593 Merging the Results of Approximate Match Operations 2004 VLDB 7.183446e-05
3,738 BLAST: a Loosely Schema-aware Meta-blocking Approach for Entity Resolution 2016 VLDB 7.0627813e-05
3,816 Trie-Join: Efficient Trie-based String Similarity Joins with Edit-Distance Constraints 2010 VLDB 7.0072547e-05
4,107 Smurf: Self-Service String Matching Using Random Forests 2019 VLDB 6.8026037e-05
4,117 Selectivity Estimation for Fuzzy String Predicates in Large Data Sets 2005 VLDB 6.7958711e-05
4,439 Incremental Maintenance of Length Normalized Indexes for Approximate String Matching 2009 SIGMOD 6.5998035e-05
4,493 Approximate String Joins with Abbreviations 2018 VLDB 6.5772891e-05
4,663 Approximate Matching of Hierarchical Data Using pq-Grams 2005 VLDB 6.4810192e-05
4,849 Probabilistic String Similarity Joins 2010 SIGMOD 6.3809679e-05
5,015 Discovering Related Data At Scale 2021 VLDB 6.3135569e-05
5,049 BEER: Blocking for Effective Entity Resolution 2021 SIGMOD 6.297901e-05
5,064 Supervised Meta-blocking 2014 VLDB 6.2906903e-05
5,112 SEAL: Spatio-Textual Similarity Search 2012 VLDB 6.268442e-05
5,143 Schema-agnostic vs Schema-based Configurations for Blocking Methods on Homogeneous Data 2016 VLDB 6.2569019e-05
5,188 Fast Subtrajectory Similarity Search in Road Networks under Weighted Edit Distance Constraints 2020 VLDB 6.2370687e-05
5,207 String Similarity Measures and Joins with Synonyms 2013 SIGMOD 6.2272365e-05
5,333 On Indexing Error-Tolerant Set Containment 2010 SIGMOD 6.1750986e-05
5,444 Pigeonring: A Principle for Faster Thresholded Similarity Search 2019 VLDB 6.1268526e-05
5,549 Faerie: Efficient Filtering Algorithms for Approximate Dictionary-based Entity Extraction 2011 SIGMOD 6.088104e-05
5,795 Efficient Approximate Search on String Collections (Tutorial) 2009 VLDB 5.9926463e-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
162 Integration of Heterogeneous Databases Without Common Domains Using Queries Based on Textual Similarity 1998 SIGMOD 0.00027536748
220 An Evaluation of Non-Equijoin Algorithms 1991 VLDB 0.00024344086
597 Distance-Based Indexing For High-Dimensional Metric Spaces 1997 SIGMOD 0.00015766567
802 Near Neighbor Search in Large Metric Spaces 1995 VLDB 0.00013847746
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# Overall Rank Paper Year Venue
1 3,593 Merging the Results of Approximate Match Operations 2004 VLDB
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3 3,816 Trie-Join: Efficient Trie-based String Similarity Joins with Edit-Distance Constraints 2010 VLDB
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