{"id":"https://openalex.org/W1544008239","doi":"https://doi.org/10.1016/b978-012722442-8/50063-x","title":"The Generalized Pre-Grouping Transformation","display_name":"The Generalized Pre-Grouping Transformation","publication_year":2003,"publication_date":"2003-01-01","ids":{"openalex":"https://openalex.org/W1544008239","doi":"https://doi.org/10.1016/b978-012722442-8/50063-x","mag":"1544008239"},"language":"en","primary_location":{"id":"doi:10.1016/b978-012722442-8/50063-x","doi":"https://doi.org/10.1016/b978-012722442-8/50063-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/b978-012722442-8/50063-x","pdf_url":null,"source":{"id":"https://openalex.org/S4306463230","display_name":"Elsevier eBooks","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"ebook platform"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings 2003 VLDB Conference","raw_type":"book-chapter"},"volume":{"id":"https://openalex.org/W4237841550","display_name":"Proceedings 2003 VLDB Conference"},"type":"conference-paper","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5089909826","display_name":"Aris Tsois","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]},{"id":"https://openalex.org/I4210144519","display_name":"Institute of Communication and Computer Systems","ror":"https://ror.org/0483fn738","country_code":"GR","type":"nonprofit","lineage":["https://openalex.org/I4210144519"]}],"countries":["GR"],"is_corresponding":true,"raw_author_name":"Aris Tsois","raw_affiliation_strings":["Institute of Communication and Computer Systems and School of Electrical and Computer Engineering National Technical University of Athens Zographou 15773, Athens, Hellas, Greece","Institute of Communication and Computer Systems and School of Electrical and Computer Engineering, National Technical University of Athens, Zographou, Athens, Hellas"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Communication and Computer Systems and School of Electrical and Computer Engineering National Technical University of Athens Zographou 15773, Athens, Hellas, Greece","institution_ids":["https://openalex.org/I174458059","https://openalex.org/I4210144519"]},{"raw_affiliation_string":"Institute of Communication and Computer Systems and School of Electrical and Computer Engineering, National Technical University of Athens, Zographou, Athens, Hellas","institution_ids":["https://openalex.org/I174458059","https://openalex.org/I4210144519"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5020449921","display_name":"Timos Sellis","orcid":"https://orcid.org/0000-0002-9067-5639","observed_orcids":["https://orcid.org/0000-0002-9067-5639"]},"institutions":[{"id":"https://openalex.org/I174458059","display_name":"National Technical University of Athens","ror":"https://ror.org/03cx6bg69","country_code":"GR","type":"education","lineage":["https://openalex.org/I174458059"]},{"id":"https://openalex.org/I4210144519","display_name":"Institute of Communication and Computer Systems","ror":"https://ror.org/0483fn738","country_code":"GR","type":"nonprofit","lineage":["https://openalex.org/I4210144519"]}],"countries":["GR"],"is_corresponding":true,"raw_author_name":"Timos Sellis","raw_affiliation_strings":["Institute of Communication and Computer Systems and School of Electrical and Computer Engineering National Technical University of Athens Zographou 15773, Athens, Hellas, Greece","Institute of Communication and Computer Systems and School of Electrical and Computer Engineering, National Technical University of Athens, Zographou, Athens, Hellas"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Institute of Communication and Computer Systems and School of Electrical and Computer Engineering National Technical University of Athens Zographou 15773, Athens, Hellas, Greece","institution_ids":["https://openalex.org/I174458059","https://openalex.org/I4210144519"]},{"raw_affiliation_string":"Institute of Communication and Computer Systems and School of Electrical and Computer Engineering, National Technical University of Athens, Zographou, Athens, Hellas","institution_ids":["https://openalex.org/I174458059","https://openalex.org/I4210144519"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5020449921","https://openalex.org/A5089909826"],"corresponding_institution_ids":["https://openalex.org/I174458059","https://openalex.org/I4210144519"],"apc_list":null,"apc_paid":null,"fwci":1.1959,"has_fulltext":false,"cited_by_count":12,"citation_normalized_percentile":{"value":0.8207179,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":94},"biblio":{"volume":null,"issue":null,"first_page":"644","last_page":"655"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.9970999956130981,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.9970999956130981,"subfield":{"id":"https://openalex.org/subfields/1705","display_name":"Computer Networks and Communications"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10538","display_name":"Data Mining Algorithms and Applications","score":0.00039999998989515007,"subfield":{"id":"https://openalex.org/subfields/1710","display_name":"Information Systems"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11106","display_name":"Data Management and Algorithms","score":0.00039999998989515007,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/functional-dependencies","display_name":"functional dependencies","score":0.8980000019073486},{"id":"https://openalex.org/keywords/inclusion-dependencies","display_name":"inclusion dependencies","score":0.9990000128746033},{"id":"https://openalex.org/keywords/join-optimization","display_name":"join optimization","score":0.6060000061988831},{"id":"https://openalex.org/keywords/relational-algebra","display_name":"relational algebra","score":0.5220000147819519},{"id":"https://openalex.org/keywords/database-query-optimization","display_name":"database query optimization","score":0.4230000078678131}],"concepts":[{"id":"https://openalex.org/C2778692605","wikidata":"https://www.wikidata.org/wiki/Q4041866","display_name":"Joins","level":2,"score":0.7758525013923645},{"id":"https://openalex.org/C204241405","wikidata":"https://www.wikidata.org/wiki/Q461499","display_name":"Transformation (genetics)","level":3,"score":0.7652961015701294},{"id":"https://openalex.org/C2776124973","wikidata":"https://www.wikidata.org/wiki/Q3183033","display_name":"Join (topology)","level":2,"score":0.6120529174804688},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.578911304473877},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.5730034708976746},{"id":"https://openalex.org/C118930307","wikidata":"https://www.wikidata.org/wiki/Q600590","display_name":"Tuple","level":2,"score":0.5483955144882202},{"id":"https://openalex.org/C45235069","wikidata":"https://www.wikidata.org/wiki/Q278425","display_name":"Table (database)","level":2,"score":0.4182394742965698},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.39910152554512024},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.34483030438423157},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.25476548075675964},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.14722630381584167},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.13797321915626526},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.08120617270469666},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.0},{"id":"https://openalex.org/C104317684","wikidata":"https://www.wikidata.org/wiki/Q7187","display_name":"Gene","level":2,"score":0.0},{"id":"https://openalex.org/C55493867","wikidata":"https://www.wikidata.org/wiki/Q7094","display_name":"Biochemistry","level":1,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/b978-012722442-8/50063-x","doi":"https://doi.org/10.1016/b978-012722442-8/50063-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/b978-012722442-8/50063-x","pdf_url":null,"source":{"id":"https://openalex.org/S4306463230","display_name":"Elsevier eBooks","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"ebook platform"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings 2003 VLDB Conference","raw_type":"book-chapter"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":27,"referenced_works":["https://openalex.org/W30481893","https://openalex.org/W107790475","https://openalex.org/W1488870204","https://openalex.org/W1538786304","https://openalex.org/W1542880907","https://openalex.org/W1592609929","https://openalex.org/W1761301028","https://openalex.org/W1825341804","https://openalex.org/W1835980735","https://openalex.org/W1846087057","https://openalex.org/W1952220400","https://openalex.org/W1989625540","https://openalex.org/W2006519067","https://openalex.org/W2008116177","https://openalex.org/W2020949660","https://openalex.org/W2047658315","https://openalex.org/W2048001632","https://openalex.org/W2048531653","https://openalex.org/W2072764742","https://openalex.org/W2093882190","https://openalex.org/W2116873825","https://openalex.org/W2122265344","https://openalex.org/W2139534868","https://openalex.org/W2163491591","https://openalex.org/W2168044462","https://openalex.org/W6632541229","https://openalex.org/W6640718884"],"related_works":["https://openalex.org/W7056763191","https://openalex.org/W1540277706","https://openalex.org/W7096352171","https://openalex.org/W7096249126","https://openalex.org/W7097783557","https://openalex.org/W2122265344","https://openalex.org/W2139534868","https://openalex.org/W1761301028","https://openalex.org/W1993238336","https://openalex.org/W2124645273"],"abstract_inverted_index":null,"counts_by_year":[{"year":2012,"cited_by_count":1}],"updated_date":"2026-10-16T09:59:22.235173","created_date":"2016-06-24T00:00:00"}