SQL row to column (and EAV model fetch data)

Label:Reference article:Http://www.williamsang.com/archives/1508.htmlScenario BriefThe school records the results, each person's choice course is different, and later will add the course, so do not need to take all the courses as a column. Database

DB2 Command Daquan

Label:Check archiving processing View Log Archive status DB2 "Select Date (CAST (start_time as TIMESTAMP)) as DATE, COUNT (*) as Number_of_logs_per_day, (Count (*) *23.4375) as AMOUNT_LOGS_DAY_MB, Dbpartitionnum as Dbpart From Sysibmadm. Db_history

[Introduction to Hadoop]-2 Ubuntu Installation and configuration Hadoop installation and configuration

Label:Ubuntu installation (Here I do not catch a map, just cite a URL, I believe that everyone's ability)Ubuntu Installation Reference Tutorial: http://jingyan.baidu.com/article/14bd256e0ca52ebb6d26129c.htmlNote the following points:1, set the

Zombie Process

Label:In the UNIX System terminology, a process that has terminated,but whose parent have not yet waited for it, is called a zombie. In a UNIX system, a process is over, but his parent process does not wait (call Wait/waitpid) him, then he will

[Concurrency parallel]_[thread synchronization]_[pthread and Win32 Critical sections (Critical section) comparison]

Tags: critical section criticalsection pthread mutex threadScene:1. In a multithreaded program, the critical section is the most common solution for synchronizing access to shared resources.2. Pthread is a cross-platform threading model, so what is

(turn) A brief talk on salt-adding value in MD5 encryption Algorithm (SALT)

Label:We know that if the password is hashed directly, then the hacker can get a hash value by obtaining this password, and then by checking the hash value dictionary (for example, MD5 password cracking site), the password of a user.Adding salt can

Basic functions of array manipulation

Label:Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (

Atitit. Win7 win8 win9 win10 win11 new features summary and strategic planning

Label:Atitit. win7 win8 win9 win10 win11 new features summary and strategic planning1. Win7 11.1. Release date October 22, 2009 11.2. Stability greatly improved, rarely blue screen freezes 11.3. Very little damage can not be started (only once,2

How to run Groovy's main class and Test class in Gradle

Label:The complete Gradle Small project: Centralization of password managementHere is the configuration example build.gradle:apply plugin:  ' Groovy ' repositories {mavenlocal ()     mavencentral ()}

About character encoding, all you need to know (ascii,unicode,utf-8,gb2312 ... )

Label:The problem of character encoding seems to be very small, often overlooked by technical staff, but it can easily lead to some puzzling problems. Here is a summary of the character encoding of some of the popular knowledge, I hope to be helpful

Five, IPv6 address representation method (level three network technology)

Label:For a complete IPv6 address, need to write 128 bits, has been divided into 8 paragraphs, 4 characters each, that is, the complete representation of a IPV6 address, need to write 32 letters, which is quite long, and easy to confuse and error,

DELL R710 Error code Rollup

Tags: r710 error code SummaryThe server is a R710 common error rollup:Error:E1422 CPU 1 Machine Check error. Power Cycle ACSolution:The system BIOS has reported a machine check error. Disconnect the system from AC power for 10 seconds, and then

13.5.1 writing data to Excel

Tags: office interactive operations13.5.1 writing data to ExcelThe interop assemblies for Excel are standard. NET assemblies that can be referenced using #r directives in F # Interactive. After referencing an assembly, you can use the class to

Proposition composition: A thorough understanding of the various search procedures for IP routing tables in a IPV4 address tree

Tags: data structure router binary search Linux kernel Internet of ThingsThis is a thesis composition. Recently always wanted to write something, but have been unable to find the topic, just received an e-mail, someone asked me the layout of the

V3 certificate Field Explanation

Tags: digital certificate signing CAOne, what is the certificate?In complex terms, the International Telecommunication Union (ITU-T) has established the digital certificate standard. In order to provide the public network user directory information

Machine learning Cornerstone Note 10--machine how to learn (2)

Label:Reprint Please specify source: http://www.cnblogs.com/ymingjingr/p/4271742.htmlDirectory machine Learning Cornerstone Note When you can use machine learning (1) Machine learning Cornerstone Note 2--When you can use machine learning (2) Machine

New Essays

Label: <title>Gitsimpletutorial</title> Gitsimpletutorialtable of Contents 1 Creating a version Library 1.1 Adding files to the repository 1.2 Summary 2

Qt make clickable label making a clickable label control

Label:The label label control in QT is not limited to the display of static text, in fact, it is very powerful, because it has setpixmap () member function, it can be used when the Display Picture window, but also real-time display camera captured

Green time, that is, returns the number of milliseconds that have elapsed since midnight in UTC January 1, 1970.

Label:Green time, that is, returns the number of milliseconds that have elapsed since midnight in UTC January 1, 1970.(*delphi gets the 13-bit green time implementation method, which is the same as the Java.lang.System.currentTimeMillis () effect in

Image Gaussian blur application-involving the use of libjpeg, NDK operations on Surfaceview, image obfuscation, source code

Tags: android ndk libjpeg picture processingReprint please keep the original link: http://write.blog.csdn.net/postedit/42400825Today's microblog, circle of friends, all kinds of social platforms are filled with photos, selfies or a variety of life

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