{"id":"https://openalex.org/W1526118135","doi":"https://doi.org/10.1007/3-540-51171-7_24","title":"On the uniqueness of nested relations","display_name":"On the uniqueness of nested relations","publication_year":1989,"publication_date":"1989-01-01","ids":{"openalex":"https://openalex.org/W1526118135","doi":"https://doi.org/10.1007/3-540-51171-7_24","mag":"1526118135"},"language":"en","primary_location":{"id":"doi:10.1007/3-540-51171-7_24","is_oa":false,"landing_page_url":"https://doi.org/10.1007/3-540-51171-7_24","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"},"type":"book-chapter","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/A5000123568","display_name":"Koichi Takeda","orcid":"https://orcid.org/0000-0001-7545-4101"},"institutions":[{"id":"https://openalex.org/I4210145865","display_name":"IBM Research - Tokyo","ror":"https://ror.org/04915qk43","country_code":"JP","type":"facility","lineage":["https://openalex.org/I1341412227","https://openalex.org/I4210114115","https://openalex.org/I4210145865"]},{"id":"https://openalex.org/I1341412227","display_name":"IBM (United States)","ror":"https://ror.org/05hh8d621","country_code":"US","type":"company","lineage":["https://openalex.org/I1341412227"]}],"countries":["JP","US"],"is_corresponding":true,"raw_author_name":"Koichi Takeda","raw_affiliation_strings":["Tokyo Research Laboratory, IBM Japan, Ltd., 5\u201319 Sanban-cho, Chiyoda-ku, 102, Tokyo, Japan","Tokyo Research Laboratory/IBM Japan Ltd.#TAB#"],"affiliations":[{"raw_affiliation_string":"Tokyo Research Laboratory, IBM Japan, Ltd., 5\u201319 Sanban-cho, Chiyoda-ku, 102, Tokyo, Japan","institution_ids":["https://openalex.org/I4210145865"]},{"raw_affiliation_string":"Tokyo Research Laboratory/IBM Japan Ltd.#TAB#","institution_ids":["https://openalex.org/I1341412227"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5000123568"],"corresponding_institution_ids":["https://openalex.org/I1341412227","https://openalex.org/I4210145865"],"apc_list":{"value":5000,"currency":"EUR","value_usd":5392},"apc_paid":null,"fwci":3.5411,"has_fulltext":false,"cited_by_count":6,"citation_normalized_percentile":{"value":0.92061955,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"139","last_page":"150"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10317","display_name":"Advanced Database Systems and Queries","score":0.9988999962806702,"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":0.9988999962806702,"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/T11010","display_name":"Logic, Reasoning, and Knowledge","score":0.9965999722480774,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"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":0.996399998664856,"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/tuple","display_name":"Tuple","score":0.7923188209533691},{"id":"https://openalex.org/keywords/uniqueness","display_name":"Uniqueness","score":0.6607136726379395},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.6449320912361145},{"id":"https://openalex.org/keywords/dependency","display_name":"Dependency (UML)","score":0.6433463096618652},{"id":"https://openalex.org/keywords/functional-dependency","display_name":"Functional dependency","score":0.5417054891586304},{"id":"https://openalex.org/keywords/constraint","display_name":"Constraint (computer-aided design)","score":0.521411657333374},{"id":"https://openalex.org/keywords/class","display_name":"Class (philosophy)","score":0.5127521753311157},{"id":"https://openalex.org/keywords/simple","display_name":"Simple (philosophy)","score":0.48481884598731995},{"id":"https://openalex.org/keywords/nested-loop-join","display_name":"Nested loop join","score":0.4414656162261963},{"id":"https://openalex.org/keywords/set","display_name":"Set (abstract data type)","score":0.4314831495285034},{"id":"https://openalex.org/keywords/nested-set-model","display_name":"Nested set model","score":0.4285692274570465},{"id":"https://openalex.org/keywords/relation","display_name":"Relation (database)","score":0.41216734051704407},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.39049628376960754},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.3754660487174988},{"id":"https://openalex.org/keywords/discrete-mathematics","display_name":"Discrete mathematics","score":0.3406113386154175},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.1260213553905487},{"id":"https://openalex.org/keywords/data-mining","display_name":"Data mining","score":0.10649463534355164},{"id":"https://openalex.org/keywords/relational-database","display_name":"Relational database","score":0.09902161359786987},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.07521998882293701},{"id":"https://openalex.org/keywords/geometry","display_name":"Geometry","score":0.052141040563583374}],"concepts":[{"id":"https://openalex.org/C118930307","wikidata":"https://www.wikidata.org/wiki/Q600590","display_name":"Tuple","level":2,"score":0.7923188209533691},{"id":"https://openalex.org/C2777021972","wikidata":"https://www.wikidata.org/wiki/Q22976830","display_name":"Uniqueness","level":2,"score":0.6607136726379395},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.6449320912361145},{"id":"https://openalex.org/C19768560","wikidata":"https://www.wikidata.org/wiki/Q320727","display_name":"Dependency (UML)","level":2,"score":0.6433463096618652},{"id":"https://openalex.org/C26320393","wikidata":"https://www.wikidata.org/wiki/Q597053","display_name":"Functional dependency","level":3,"score":0.5417054891586304},{"id":"https://openalex.org/C2776036281","wikidata":"https://www.wikidata.org/wiki/Q48769818","display_name":"Constraint (computer-aided design)","level":2,"score":0.521411657333374},{"id":"https://openalex.org/C2777212361","wikidata":"https://www.wikidata.org/wiki/Q5127848","display_name":"Class (philosophy)","level":2,"score":0.5127521753311157},{"id":"https://openalex.org/C2780586882","wikidata":"https://www.wikidata.org/wiki/Q7520643","display_name":"Simple (philosophy)","level":2,"score":0.48481884598731995},{"id":"https://openalex.org/C1306188","wikidata":"https://www.wikidata.org/wiki/Q4060687","display_name":"Nested loop join","level":2,"score":0.4414656162261963},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.4314831495285034},{"id":"https://openalex.org/C103000020","wikidata":"https://www.wikidata.org/wiki/Q1978426","display_name":"Nested set model","level":3,"score":0.4285692274570465},{"id":"https://openalex.org/C25343380","wikidata":"https://www.wikidata.org/wiki/Q277521","display_name":"Relation (database)","level":2,"score":0.41216734051704407},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.39049628376960754},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.3754660487174988},{"id":"https://openalex.org/C118615104","wikidata":"https://www.wikidata.org/wiki/Q121416","display_name":"Discrete mathematics","level":1,"score":0.3406113386154175},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.1260213553905487},{"id":"https://openalex.org/C124101348","wikidata":"https://www.wikidata.org/wiki/Q172491","display_name":"Data mining","level":1,"score":0.10649463534355164},{"id":"https://openalex.org/C5655090","wikidata":"https://www.wikidata.org/wiki/Q192588","display_name":"Relational database","level":2,"score":0.09902161359786987},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.07521998882293701},{"id":"https://openalex.org/C2524010","wikidata":"https://www.wikidata.org/wiki/Q8087","display_name":"Geometry","level":1,"score":0.052141040563583374},{"id":"https://openalex.org/C111472728","wikidata":"https://www.wikidata.org/wiki/Q9471","display_name":"Epistemology","level":1,"score":0.0},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1007/3-540-51171-7_24","is_oa":false,"landing_page_url":"https://doi.org/10.1007/3-540-51171-7_24","pdf_url":null,"source":{"id":"https://openalex.org/S106296714","display_name":"Lecture notes in computer science","issn_l":"0302-9743","issn":["0302-9743","1611-3349"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319900","host_organization_name":"Springer Science+Business Media","host_organization_lineage":["https://openalex.org/P4310319900","https://openalex.org/P4310319965"],"host_organization_lineage_names":["Springer Science+Business Media","Springer Nature"],"type":"book series"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Lecture Notes in Computer Science","raw_type":"book-chapter"}],"best_oa_location":null,"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/10","display_name":"Reduced inequalities","score":0.5}],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":25,"referenced_works":["https://openalex.org/W180578187","https://openalex.org/W206938344","https://openalex.org/W1537255304","https://openalex.org/W1748956599","https://openalex.org/W1943598411","https://openalex.org/W1984112214","https://openalex.org/W1985581502","https://openalex.org/W1988120834","https://openalex.org/W1991128042","https://openalex.org/W2005471433","https://openalex.org/W2011039300","https://openalex.org/W2049550855","https://openalex.org/W2057852703","https://openalex.org/W2076486060","https://openalex.org/W2082395701","https://openalex.org/W2115822498","https://openalex.org/W2158655585","https://openalex.org/W2168578744","https://openalex.org/W2489748212","https://openalex.org/W2788164529","https://openalex.org/W4249783758","https://openalex.org/W4285719527","https://openalex.org/W6605986943","https://openalex.org/W6640782468","https://openalex.org/W6678706616"],"related_works":["https://openalex.org/W2116767780","https://openalex.org/W2392606101","https://openalex.org/W3162070149","https://openalex.org/W2072918301","https://openalex.org/W165346131","https://openalex.org/W2133756937","https://openalex.org/W1594511838","https://openalex.org/W4285259755","https://openalex.org/W2385315033","https://openalex.org/W2362842011"],"abstract_inverted_index":null,"counts_by_year":[],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}