{"id":"https://openalex.org/W2020608734","doi":"https://doi.org/10.1016/0022-0000(84)90076-x","title":"The tree projection theorem and relational query processing","display_name":"The tree projection theorem and relational query processing","publication_year":1984,"publication_date":"1984-02-01","ids":{"openalex":"https://openalex.org/W2020608734","doi":"https://doi.org/10.1016/0022-0000(84)90076-x","mag":"2020608734"},"language":"en","primary_location":{"id":"doi:10.1016/0022-0000(84)90076-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0022-0000(84)90076-x","pdf_url":null,"source":{"id":"https://openalex.org/S141020589","display_name":"Journal of Computer and System Sciences","issn_l":"0022-0000","issn":["0022-0000","1090-2724"],"is_oa":false,"is_in_doaj":false,"is_core":true,"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":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Computer and System Sciences","raw_type":"journal-article"},"type":"article","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/A5046952414","display_name":"Nathan Goodman","orcid":null},"institutions":[{"id":"https://openalex.org/I2801851002","display_name":"Harvard University Press","ror":"https://ror.org/006v7bf86","country_code":"US","type":"other","lineage":["https://openalex.org/I136199984","https://openalex.org/I2801851002"]}],"countries":["US"],"is_corresponding":true,"raw_author_name":"Nathan Goodman","raw_affiliation_strings":["Aiken Computation Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA"],"affiliations":[{"raw_affiliation_string":"Aiken Computation Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA","institution_ids":["https://openalex.org/I2801851002"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5047193562","display_name":"Oded Shmueli","orcid":"https://orcid.org/0000-0003-4304-310X"},"institutions":[{"id":"https://openalex.org/I2801851002","display_name":"Harvard University Press","ror":"https://ror.org/006v7bf86","country_code":"US","type":"other","lineage":["https://openalex.org/I136199984","https://openalex.org/I2801851002"]}],"countries":["US"],"is_corresponding":false,"raw_author_name":"Oded Shmueli","raw_affiliation_strings":["Aiken Computation Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA"],"affiliations":[{"raw_affiliation_string":"Aiken Computation Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA","institution_ids":["https://openalex.org/I2801851002"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5046952414"],"corresponding_institution_ids":["https://openalex.org/I2801851002"],"apc_list":{"value":2520,"currency":"USD","value_usd":2520},"apc_paid":null,"fwci":1.881,"has_fulltext":false,"cited_by_count":24,"citation_normalized_percentile":{"value":0.85711702,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":97},"biblio":{"volume":"28","issue":"1","first_page":"60","last_page":"79"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.9998999834060669,"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":0.9998999834060669,"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/T11106","display_name":"Data Management and Algorithms","score":0.9991999864578247,"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"}},{"id":"https://openalex.org/T12016","display_name":"Web Data Mining and Analysis","score":0.9945999979972839,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/joins","display_name":"Joins","score":0.7886440753936768},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.7406591773033142},{"id":"https://openalex.org/keywords/query-optimization","display_name":"Query optimization","score":0.6781215071678162},{"id":"https://openalex.org/keywords/conjunctive-query","display_name":"Conjunctive query","score":0.654238760471344},{"id":"https://openalex.org/keywords/sort-merge-join","display_name":"Sort-merge join","score":0.6054669618606567},{"id":"https://openalex.org/keywords/hash-join","display_name":"Hash join","score":0.5640400648117065},{"id":"https://openalex.org/keywords/schema","display_name":"Schema (genetic algorithms)","score":0.5537129044532776},{"id":"https://openalex.org/keywords/relational-database","display_name":"Relational database","score":0.5532320737838745},{"id":"https://openalex.org/keywords/join","display_name":"Join (topology)","score":0.5424299240112305},{"id":"https://openalex.org/keywords/query-language","display_name":"Query language","score":0.5140770673751831},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.5104748010635376},{"id":"https://openalex.org/keywords/spatial-query","display_name":"Spatial query","score":0.49419906735420227},{"id":"https://openalex.org/keywords/sargable","display_name":"Sargable","score":0.4636686146259308},{"id":"https://openalex.org/keywords/view","display_name":"View","score":0.4459607005119324},{"id":"https://openalex.org/keywords/database","display_name":"Database","score":0.4360731840133667},{"id":"https://openalex.org/keywords/datalog","display_name":"Datalog","score":0.4117889404296875},{"id":"https://openalex.org/keywords/tree","display_name":"Tree (set theory)","score":0.4105226993560791},{"id":"https://openalex.org/keywords/information-retrieval","display_name":"Information retrieval","score":0.26924529671669006},{"id":"https://openalex.org/keywords/web-search-query","display_name":"Web search query","score":0.24020010232925415},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.2028307318687439},{"id":"https://openalex.org/keywords/database-design","display_name":"Database design","score":0.19604945182800293},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.17575156688690186},{"id":"https://openalex.org/keywords/combinatorics","display_name":"Combinatorics","score":0.10360333323478699}],"concepts":[{"id":"https://openalex.org/C2778692605","wikidata":"https://www.wikidata.org/wiki/Q4041866","display_name":"Joins","level":2,"score":0.7886440753936768},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.7406591773033142},{"id":"https://openalex.org/C157692150","wikidata":"https://www.wikidata.org/wiki/Q2919848","display_name":"Query optimization","level":2,"score":0.6781215071678162},{"id":"https://openalex.org/C65647387","wikidata":"https://www.wikidata.org/wiki/Q1781706","display_name":"Conjunctive query","level":3,"score":0.654238760471344},{"id":"https://openalex.org/C203570394","wikidata":"https://www.wikidata.org/wiki/Q4060688","display_name":"Sort-merge join","level":3,"score":0.6054669618606567},{"id":"https://openalex.org/C188805328","wikidata":"https://www.wikidata.org/wiki/Q4060691","display_name":"Hash join","level":3,"score":0.5640400648117065},{"id":"https://openalex.org/C52146309","wikidata":"https://www.wikidata.org/wiki/Q7431116","display_name":"Schema (genetic algorithms)","level":2,"score":0.5537129044532776},{"id":"https://openalex.org/C5655090","wikidata":"https://www.wikidata.org/wiki/Q192588","display_name":"Relational database","level":2,"score":0.5532320737838745},{"id":"https://openalex.org/C2776124973","wikidata":"https://www.wikidata.org/wiki/Q3183033","display_name":"Join (topology)","level":2,"score":0.5424299240112305},{"id":"https://openalex.org/C192028432","wikidata":"https://www.wikidata.org/wiki/Q845739","display_name":"Query language","level":2,"score":0.5140770673751831},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.5104748010635376},{"id":"https://openalex.org/C172722865","wikidata":"https://www.wikidata.org/wiki/Q2302053","display_name":"Spatial query","level":5,"score":0.49419906735420227},{"id":"https://openalex.org/C192939062","wikidata":"https://www.wikidata.org/wiki/Q104840822","display_name":"Sargable","level":4,"score":0.4636686146259308},{"id":"https://openalex.org/C54239708","wikidata":"https://www.wikidata.org/wiki/Q1329910","display_name":"View","level":3,"score":0.4459607005119324},{"id":"https://openalex.org/C77088390","wikidata":"https://www.wikidata.org/wiki/Q8513","display_name":"Database","level":1,"score":0.4360731840133667},{"id":"https://openalex.org/C148230440","wikidata":"https://www.wikidata.org/wiki/Q1172264","display_name":"Datalog","level":2,"score":0.4117889404296875},{"id":"https://openalex.org/C113174947","wikidata":"https://www.wikidata.org/wiki/Q2859736","display_name":"Tree (set theory)","level":2,"score":0.4105226993560791},{"id":"https://openalex.org/C23123220","wikidata":"https://www.wikidata.org/wiki/Q816826","display_name":"Information retrieval","level":1,"score":0.26924529671669006},{"id":"https://openalex.org/C164120249","wikidata":"https://www.wikidata.org/wiki/Q995982","display_name":"Web search query","level":3,"score":0.24020010232925415},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.2028307318687439},{"id":"https://openalex.org/C148840519","wikidata":"https://www.wikidata.org/wiki/Q1049878","display_name":"Database design","level":2,"score":0.19604945182800293},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.17575156688690186},{"id":"https://openalex.org/C114614502","wikidata":"https://www.wikidata.org/wiki/Q76592","display_name":"Combinatorics","level":1,"score":0.10360333323478699},{"id":"https://openalex.org/C97854310","wikidata":"https://www.wikidata.org/wiki/Q19541","display_name":"Search engine","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1016/0022-0000(84)90076-x","is_oa":false,"landing_page_url":"https://doi.org/10.1016/0022-0000(84)90076-x","pdf_url":null,"source":{"id":"https://openalex.org/S141020589","display_name":"Journal of Computer and System Sciences","issn_l":"0022-0000","issn":["0022-0000","1090-2724"],"is_oa":false,"is_in_doaj":false,"is_core":true,"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":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Computer and System Sciences","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":22,"referenced_works":["https://openalex.org/W52840101","https://openalex.org/W1975714036","https://openalex.org/W1977735896","https://openalex.org/W1985581502","https://openalex.org/W2001476721","https://openalex.org/W2007522541","https://openalex.org/W2011039300","https://openalex.org/W2032386524","https://openalex.org/W2038827269","https://openalex.org/W2039610696","https://openalex.org/W2046649829","https://openalex.org/W2062073350","https://openalex.org/W2066954445","https://openalex.org/W2075198446","https://openalex.org/W2104498537","https://openalex.org/W2137016255","https://openalex.org/W2148417962","https://openalex.org/W2153485419","https://openalex.org/W6602175484","https://openalex.org/W6652342470","https://openalex.org/W6659612569","https://openalex.org/W6680479728"],"related_works":["https://openalex.org/W20972493","https://openalex.org/W2338525844","https://openalex.org/W2951257011","https://openalex.org/W4299540831","https://openalex.org/W2896766859","https://openalex.org/W4288363924","https://openalex.org/W2740681086","https://openalex.org/W2926816154","https://openalex.org/W4389096604","https://openalex.org/W2074890970"],"abstract_inverted_index":null,"counts_by_year":[{"year":2022,"cited_by_count":1},{"year":2021,"cited_by_count":2},{"year":2017,"cited_by_count":1},{"year":2016,"cited_by_count":3},{"year":2014,"cited_by_count":1},{"year":2013,"cited_by_count":1},{"year":2012,"cited_by_count":1}],"updated_date":"2026-03-10T14:07:55.174380","created_date":"2025-10-10T00:00:00"}