dplyr package

#!/bin/bash Error_check () {if [$1-ne 0];then echo "$" Exit $ fi} copy_file () {cp-f- A-v $ Error_check $? ' Not Found '} rm_file () {for file in $@;d o if [-E "$file"];then rm-vf $file fi Done} rm_dir () {to dir in $@;d o if [d "$dir"];then rm-vrf $dir fi Done} show _opts () {echo "Deb-build is help for generating deb packages" echo "Basic function:" echo "create Create a Debian rule when building package for the ' the "" echo "Build

Conn Scott/tiger;grant insert,update,delete on EMP to System;conn system/orcl1234;create or replace VIEW V_empas select em Pno,ename,job,hiredate,deptno from Scott.emp;IndexIn order to improve the speed of the query, when the user is not satisfied with the query speed and needs to adjust the performance of the database, it is preferred to establish an index.CREATE INDEX idx_ename on employee (ename, Sal DESC);Proper use of indexes can improve the speed of data retrieval and can create indexes on

3 Source Package Management3.1 the difference between the source package and the RPM package(1) Difference: ① difference before installation: conceptual difference; ② after installation: different installation locations(2) default installation location for RPM packages RPM Package Default installation pat

This is a creation in Article, where the information may have evolved or changed. Recently Learning Revel (Golang Web Development Framework), learn how Revel manages and loads all controllers. The basic knowledge involved in Golang is the import package. Let's take a look at several methods and features of the Golang Imort package: The first way relative to the path Import "./module" //The module dire

Detailed jar commandjar {ctxu}[vfm0m] [jar-file] [manifest-file] [-C directory] File name ...where {CTXU} is a subcommand of the jar command, each time the jar command can contain only one of the CTXU, each of which represents: -C Create a new JAR file package -t lists the contents list of the JAR file package -X expands the specified file or all files of the JAR

Linux general technology-Linux programming and kernel information. RedHat Enterprise Edition since AS4 and since FC3, the rpm installation package of kernel-sourcecode is no longer provided separately, because RedHat does not consider it necessary to maintain a separate kernel-sourcecode package, because all source code packages should be included. in. src. in rpm instead of in rpm. Therefore, you can manua

Java software package and java software package Java software package: in short, the software package puts classes in different folders and provides namespaces. Package wang; // use package to put the Test class under the wang F

about how to package/Run the jar package, and generate EXE files. Before a variety of inquiries, blogs, finally find out exactly what happened. I remember taking notes. Today to package generation EXE with the time, incredibly forget how. To check the previous notes, it was not found (as if it had been deleted). decided to write it down so that it can be called a

Reprint: Http://hxraid.iteye.com/blog/483115?page=3#commentsWe often read some resource files in the code (compared to slices, music, text, etc.). These simple processes are of course not problematic when running alone. However, if we make the code into a jar package, even if the resource files are packaged together, these things will not be found. Take a look at the following code://Source Code 1:Package E

In the R language, it is often necessary to see which package loads or looks at a number of similar functions, to see exactly which package is working, and to run the comparison analysis after loading and unloading.1. View Loaded Packages> (. Packages ())Note that the outer brackets and the preceding points cannot be saved.2. Remove the loaded Packagesuch as removing the Rmysql

the back int 3) when type = = 0xfd, reading the back int 4) when type = = 0xFE, reading the back int So what is the type 0xFF and 0XFB? Here, dig the pit and fill it later. What can be a spoiler: 0xFF generally represents an action error in the MySQL interaction protocol, This response occurs when an insert command fails to be sent. And 0XFB is null, that is, the MySQL insertion value is often null, which means null 2. String type The string types here can be used to represent MySQL's high prec

Through the basic task and transforms learning, you can now transfer to the practical application of SSIs. In the end-to-end package series, we first explain how to import a series of file data to SQL Server, and then add some complex conversions, finally, we will see how to handle errors in the package and dynamically create a package. Create a project Th

Linux source code package installation and script installation, linux source code package script YesVi INSTALLCheck the installation process. 1. Install the source code package 2. Script Installation What are the basic steps for installing the source code package in linux? Detailed description of the installation pro

1. OracleThe role of Package: It can simplify application design, improve application performance, hide information, and overload subprograms. 2. Functions in ORACLE, Package, packageThe differences between bodies and procedure are the same: Function has return values, parameters, procedure has no return values, parameters, package, packageThe body exists at the

The first thing to do in MyBatis is to automatically create an item that updates the table structure through annotations, where the class of all entity classes is acquired after spring is loaded, to get annotations on the attributes of the entity class, and to analyze the table structure to create a modified table structure.So you need a function to get all the classes under the package by the package name,

Android v7 package import common errors, and project reference v7 package error solution, androidv7 In android, v4 v7 v21 and other packages are extended support packages for the android system. You just want to install windows System patches. Android extension packages are mainly used to be compatible with earlier versions. For example, if actionbar is displayed after android 3.0, the mobile phone system m

Xcodebuild package command, xcodebuild package1. Set the project to manual signature2. Add in plist:? ? ProvisioningProfiles? Dictionary? ? ? ? $ BuildleID? ? String? Profile name? ? Method? ? ? ? ? String? $ Method? ? Where: $ buildleID is app Bundle Identifier? ? ? ? $ Method includes four types: app-store, ad-hoc, enterprise, and development.3. execute commandsXcodebuild archive-project $ {OUTPUT_NAME }. xcodeproj-scheme $ {OUTPUT_NAME}-configurati

1. About the namespace of a package ): (1) If no parameter is found, go to the invalid parameter to locate the action. If no value is found, the action will be taken; (2) If the parameter value is found, but this action is not available in the parameter value, it is recommended that you find the parameter value by default, if this action is found, the operation cannot be found. If this action is left blank, the operation is directly executed; (3) A

Using the yum command in the centos system is indeed a pleasant task, but there are also various problems in some cases. One we met today is very tricky. Yum install XXX. rpm Warning: Package XXX. rpm is not signed Google, the solution is1. Modify yum. conf Path:/etc/yum. conf Find gpgcheck = 1 Change it to 0: gpgcheck = 0 2. Modify/etc/yum. Repos. d/utterramblings. repo. Find gpgcheck = 1 Change it to 0: gpgcheck = 0 However, after these

normally and has been pushed for millions every day. It has not encountered any problems after several months of stable operation.However, there are still a large number of resources not recycled in the jmap process. In addition, full gc blocking has recently occurred, resulting in restart events. (Another reason may be that all nodes are pushed to a foreign machine, and the memory is very low, only 512 M -.-)For this evaluation, I generally know that when there are many pushes, there will be a