{"title":"更新已定义的关系","authors":"I. M. Osman","doi":"10.1109/MARK.1979.8817229","DOIUrl":null,"url":null,"abstract":"Some relational data base systems 1 such as PRTV 2 and SEQUEL allow the user to create his own relations (logical files) as subsets of the main data. With such a facility the user may express his own view of the data in terms of the relations he creates. If a large number of such relations are created, disc storage space problems and other maintenance difficulties can arise.","PeriodicalId":341008,"journal":{"name":"1979 International Workshop on Managing Requirements Knowledge (MARK)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1899-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":"{\"title\":\"Updating defined relations\",\"authors\":\"I. M. Osman\",\"doi\":\"10.1109/MARK.1979.8817229\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Some relational data base systems 1 such as PRTV 2 and SEQUEL allow the user to create his own relations (logical files) as subsets of the main data. With such a facility the user may express his own view of the data in terms of the relations he creates. If a large number of such relations are created, disc storage space problems and other maintenance difficulties can arise.\",\"PeriodicalId\":341008,\"journal\":{\"name\":\"1979 International Workshop on Managing Requirements Knowledge (MARK)\",\"volume\":\"1 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1899-12-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"14\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"1979 International Workshop on Managing Requirements Knowledge (MARK)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/MARK.1979.8817229\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"1979 International Workshop on Managing Requirements Knowledge (MARK)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MARK.1979.8817229","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Some relational data base systems 1 such as PRTV 2 and SEQUEL allow the user to create his own relations (logical files) as subsets of the main data. With such a facility the user may express his own view of the data in terms of the relations he creates. If a large number of such relations are created, disc storage space problems and other maintenance difficulties can arise.
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