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COALESCE, ISNULL
(2014-07-18 06:30:55)
BothreplaceNULLvalues.
whichonehasbetterperformace?
whichonehasbetterconcurrencycontrol?[阅读全文]
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SaaS (Software as a Service) -- 软件即服务
(2014-07-16 13:01:01)
WhatisSaaS? Softwareasaservice(orSaaS)isawayofdeliveringapplicationsovertheInternet—asaservice.Insteadofinstallingandmaintainingsoftware,yousimplyaccessitviatheInternet,freeingyourselffromcomplexsoftwareandhardwaremanagement. SaaSapplicationsaresometimescalledWeb-basedsoftware,on-demandsoftware,orhostedsoftware.Whateverthename,SaaSapplicationsrunonaSaaSprovider’sservers.Theproviderma...[阅读全文]
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kappa-test, A/B testing, split testing, code test, clustering
(2014-07-07 07:44:59)
A/Btesting,t-test
Kagglecontest
tobeupdated[阅读全文]
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