Mongodb Group By Two Fields

December 2014 12-14th, hosted by the China Computer Society (CCF), CCF large data Expert committee, the Chinese Academy of Sciences and CSDN co-organizer of the 2014 China Large Data Technology conference (DA data Marvell Conference 2014,BDTC 2014 will be opened at Crowne Plaza Hotel, New Yunnan, Beijing. The three-day conference aims to promote the development of large data technology in the industry, and to set up "large data Infrastructure" and "large data ..."

From 2008 only 60 people attended the technical salon to the present thousands of people technical feast, as the industry has a very practical value of the professional Exchange platform, has successfully held the seven China large Data technology conference faithfully portrayed a large data field in the technical hot spot, precipitated the industry's actual combat experience, witnessed the development and evolution of the whole large data ecological circle technology. December 12-14th, hosted by the China Computer Society (CCF), CCF large data expert committee, the Institute of Computing Technology of the Chinese Academy of Sciences and CSDN co-organized the 2014 China Large Data Technology conference (Big&n ...

Martin Leach is very busy with big data work. He worked as CIO at the Broad Institute, a joint MIT and Harvard University, where he was responsible for storing 13PB of data, using supercomputers for computing. He and his team have made a remarkable contribution to the human genome mapping effort. Before the institute, his team supported the research team for the pharmaceutical giant Merck development. Now, his new job is the vice president of it research at biotech company Biogen, who currently has some data scientists in the team. This team passes big data ...

"Editor's note" Docker has changed many things in the field of application development and has become one of the most popular open source projects, and fundamentally changed the way people build applications. Docker is changing cloud development practices, allowing anyone to leverage the best practices of the packaged community in the form of other containers, like the Lego toys of cloud components. Docker is like a forest fire, and the new Linux container technology has ignited everything around it in its own way, and many of us are struggling to keep up with the speed at which it spreads. Docke ...

The title, but hope that users do not misunderstand, here is the need for large data technology in the current development process, is not to hinder the application of O2O, and for O2O, the most difficult than the source of data.   　　This is presumably also a lot of nuggets electric dealers, O2O manufacturers of the distress, but also the future to seize the O2O market opportunity for a watershed. In fact, O2O is not a new term in the field of electric business, as early as the group buying site began to appear. Baidu Encyclopedia for O2O definition for online to Offline (offline ...