{"title":"Computable queries for relational data bases (Preliminary Report)","authors":"A. K. Chandra, D. Harel","doi":"10.1145/800135.804423","DOIUrl":null,"url":null,"abstract":"The concept of a “reasonable” query in a relational data base is investigated. We provide an abstract characterization of the class of queries which are computable, and define the completeness of a query language as the property of being precisely powerful enough to express the queries in this class. Our main result is the completeness of a simple programming language which can be thought of as consisting of the relational algebra augmented with the power of iteration.","PeriodicalId":176545,"journal":{"name":"Proceedings of the eleventh annual ACM symposium on Theory of computing","volume":"101 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1979-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"22","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the eleventh annual ACM symposium on Theory of computing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1145/800135.804423","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 22
Abstract
The concept of a “reasonable” query in a relational data base is investigated. We provide an abstract characterization of the class of queries which are computable, and define the completeness of a query language as the property of being precisely powerful enough to express the queries in this class. Our main result is the completeness of a simple programming language which can be thought of as consisting of the relational algebra augmented with the power of iteration.
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