dplyr 0.4.0 January 9, 2015 in Uncategorized I’m very pleased to announce that dplyr 0.4.0 is now available from CRAN. Get the latest version by running: install.packages("dplyr") dplyr 0.4.0 includes over 80 minor improvements and bug fixes, wh…

目录 select The filter and arrange verbs arrange filter Filtering and arranging Mutate The count verb Summarizing top_n Selecting rename transmute Grouped mutates Window functions Data Manipulation with dplyr in R select select(data,变量名) The filter and…

If your primary objective is to query your data in Hadoop to browse, manipulate, and extract it into R, then you probably want to use SQL. You can write SQL code explicitly to interact with Hadoop, or you can write SQL code implicitly with dplyr. The…

HBase shell commands As told in HBase introduction, HBase provides Extensible jruby-based (JIRB) shell as a feature to execute some commands(each command represents one functionality). HBase shell commands are mainly categorized into 6 parts 1) Gener…

FROM: http://blog.itpub.net/26736162/viewspace-1252569/?page=2 http://blog.csdn.net/elearnings/article/details/10103611 http://blog.csdn.net/rlhua/article/details/12651683 http://blog.csdn.net/wjguo/article/details/26594685 1. View the Exhibit and ex…

choose three Which three statements are true about Oracle Data Pump? A) Oracle Data Pump export and import operations can be performed only by users with the SYSDBA privilege. B) IMPDP can be used to change target data file names, schemas, and tables…

以下内容主要参照 Introducing dplyr 和 dplyr 包自带的简介 (Introduction to dplyr), 复制了原文对应代码, 并夹杂了个人理解和观点 (多附于括号内). 0 初始化0.1 安装 install.packages("dplyr") 0.2 示范数据 library(Lahman): Lahman 包里的棒球比赛数据集 Batting library(hflights): hflights 包里的飞机航班数据 0.3 数据集类型 将过长过大的数…

引言 2014年刚到, 就在 Feedly 订阅里看到 RStudio Blog 介绍 dplyr 包已发布 (Introducing dplyr), 此包将原本 plyr 包中的 ddply() 等函数进一步分离强化, 专注接受dataframe对象, 大幅提高了速度, 并且提供了更稳健的与其它数据库对象间的接口. 既然是 Hadley Wickham 的新作, 并自称 a grammar of data manipulation, 当然要先学为快了, 正好新申了域名, 就把原本记在 Rmd …

Tidyverse 学习笔记 1.gapminder 我理解的gapminder应该是一个内置的数据集 加载之后使用 > # Load the gapminder package > library(gapminder) > # Load the dplyr package > library(dplyr) > # Look at the gapminder dataset > gapminder A tibble: 1,704 x 6 country continen…

在项目组中做ETL开发时,经常会被问到:“现在ETL跑到哪一个Package了?” 为了缩短ETL运行的时间,在ETL的设计上,经常会使用并发执行模式:Task 并发执行,Package并发执行.对于Package 并发执行模式,实现方式是:在SSIS Server上部署Package Job,每个Job Step执行一个Package Manager,该Package Manager以并发方式调用Execute Package Task,因此,在同一时间存在多个Child packages同时…