By Georg Lausen, Dan Suciu
ISBN-10: 3540208968
ISBN-13: 9783540208969
The papers during this quantity symbolize the technical software of the ninth Biennial WorkshoponDataBasesandProgrammingLanguages(DBPL2003),whichwas hung on September 6-8, 2003, in Potsdam, Germany. The workshop meets each years, and is a well-established discussion board for ideas that lie on the intersection of database and programming language learn. DBPL 2003 persisted the t- dition of excellence initiated by means of its predecessors in Rosco?, Finistre (1987), S- ishan, Oregon (1989), Nafplion, Argolida (1991), long island, long island (1993), Gubbio, Umbria (1995), Estes Park, Colorado (1997), Kinloch Rannoch, Sc- land (1999), and Frascati, Rome (2001). Theprogramcommitteeselected14papersoutof22submissions,andinvited twocontributions.The16talkswerepresentedoverthreedays,insevensessions. In theinvitedtalk Jennifer Widom provided the paper CQL: a Language forContinuousQueriesoverStreamsandRelations,coauthoredbyArvindArasu andShivnathBabu.Whilealotofresearchhasbeendonerecentlyonqueryp- cessingoverdatastreams,CQLisvirtuallythe?rstproposalofaquerylanguage on streams that may be a strict extension of SQL. The language is based round an easy but robust notion: it has particular info varieties, family and streams, with well-de?ned operators for mapping among them. Window speci?cation expressions, comparable to sliding home windows, map streams to relatives, whereas operators equivalent to ’’insert stream,’’ ’’delete stream,’’ and ’’relation stream’’ map kinfolk to streams by way of returning, at every one second in time, the newly inserted tuples, the deleted tuples, or a picture of the full relation. the various examples during this paper make a resounding case for the facility and value of CQL