我使用Rtudio環(huán)境，安裝sqldb幾次出錯(cuò)。網(wǎng)上沒有好的教程。
經(jīng)過(guò)自己試驗(yàn)之后，這樣處理。我寫出來(lái)以后，供大家參考。
> install.packages("sqldf")also installing the dependencies ‘BH’, ‘plogr’, ‘gsubfn’, ‘PRoto’, ‘RSQLite’, ‘DBI’, ‘chron’trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.3/BH_1.62.0-1.zapplication/zip' length 16150075 bytes (15.4 MB)downloaded 3.8 MB...Warning in install.packages : error 1 in extracting from zip fileWarning in install.packages : cannot open compressed file 'BH/DESCRIPTION', probable reason 'No such file or directory'Error in install.packages : cannot open the connection解決辦法： 1.徹底退出你的360。 2.在RStudio里設(shè)置在某個(gè)鏡像站下載包的 在Rtudio中菜單欄點(diǎn)擊tool>global option>packages>change 選擇China (Beijing) [https] - TUNA Team, Tsinghua University
然后就可以安裝出來(lái)了。
> install.packages("sqldf")also installing the dependencies ‘BH’, ‘plogr’, ‘gsubfn’, ‘proto’, ‘RSQLite’, ‘DBI’, ‘chron’...The downloaded binary packages are in C:/Users/yichenfan/AppData/Local/Temp/RtmpOO6hO7/downloaded_packages輸入library(sqldf)
> library(sqldf)載入需要的程輯包：gsubfn載入需要的程輯包：proto載入需要的程輯包：RSQLite> newdf<-sqldf("select * from mtcars where carb=1 order by mpg",row.names=TRUE)Loading required package: tcltkWarning message:Quoted identifiers should have class SQL, use DBI::SQL() if the caller performs the quoting.我們看到又出錯(cuò)了。
我們檢查一下tcltk
> capabilities()["tcltk"]tcltk TRUE此時(shí)我們使用SQL語(yǔ)句，就可以操作了
> library(sqldf)> newdf<-sqldf("select * from mtcars where carb=1 order by mpg",row.names=TRUE)> newdf mpg cyl disp hp drat wt qsec vs am gear carbValiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1新聞熱點(diǎn)
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