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Deco's data model was designed to be general, flexible, and principled. Deco's query language extends SQL with simple constructs necessary for crowdsourcing, and has a precise semantics for arbitrary queries. Deco's query execution engine and cost-based query optimizer incorporate many novel techniques to address the limitations of traditional query processing techniques in the crowdsourcing setting. Query processing is guided by the objective of minimizing monetary cost and reducing latency.<\/jats:p>","DOI":"10.1145\/2430456.2430462","type":"journal-article","created":{"date-parts":[[2013,1,22]],"date-time":"2013-01-22T15:28:56Z","timestamp":1358868536000},"page":"22-27","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":21,"title":["An overview of the deco system"],"prefix":"10.1145","volume":"41","author":[{"given":"Hyunjung","family":"Park","sequence":"first","affiliation":[{"name":"Stanford University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard","family":"Pang","sequence":"additional","affiliation":[{"name":"Google, Inc."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aditya","family":"Parameswaran","sequence":"additional","affiliation":[{"name":"Stanford University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hector","family":"Garcia-Molina","sequence":"additional","affiliation":[{"name":"Stanford University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neoklis","family":"Polyzotis","sequence":"additional","affiliation":[{"name":"UC Santa Cruz"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer","family":"Widom","sequence":"additional","affiliation":[{"name":"Stanford University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2013,1,17]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Mechanical Turk. http:\/\/mturk.com.  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Query processing over crowdsourced data, http:\/\/ilpubs.stanford.edu:8090\/1052\/. Technical report , Stanford InfoLab , 2012 . H. Park, A. Parameswaran, and J. Widom. Query processing over crowdsourced data, http:\/\/ilpubs.stanford.edu:8090\/1052\/. Technical report, Stanford InfoLab, 2012."},{"key":"e_1_2_1_15_1","volume-title":"Stanford InfoLab","author":"Park H.","year":"2012","unstructured":"H. Park and J. Widom . Query optimization over crowdsourced data, http:\/\/ilpubs.stanford.edu:8090\/1063\/. Technical report , Stanford InfoLab , 2012 . H. Park and J. Widom. Query optimization over crowdsourced data, http:\/\/ilpubs.stanford.edu:8090\/1063\/. 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