2014-06-06-sql-for-statistics

Label:<title>2014-06-06-sql-for-statistics</title>---layout:defaulttitle: Use SQL statements to do simple data statistics Category:tech---{{page.title}}Have done a period of time data analysis work, when just took over the work, but also

Talk about MD5 encryption algorithm

Label:MD5 is a secure hashing algorithm, input two different plaintext will not get the same output value, according to the output value, can not get the original plaintext, that is, its process is irreversible; So to decrypt MD5 there is no

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win10 localhost resolves to ipv6 address:: 1 Solution

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Why is NaN not equal to itself?

Label:Nan is ' not a number ', is not a digit, so what is Nan exactly? In JavaScript, there are 6 big data types, including String,number,boolean,undefined,null and object, and for JS, integers and floating-point numbers are collectively referred to

sphinx-2.2.10-1.rhel6.x86_64 RPM Package Installation location

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Echo Cancellation-Theory Chapter

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ACM Number Theory Tour 3---Greatest common divisor gcd and least common multiple LCM (struck, rebuild ( ̄? ̄))

Label:GCD (A, B) is the greatest common divisor of A and BLCM (A, b), which is the least common multiple of a and BAnd then there's a formula.A*b = gcd * LCM (GCD is gcd (A, B), (?∀?) shorthand do you understand?)Explain (skip if you don't want to

MP3 file ID3v2 The meaning of frame identification

Label:MP3 file ID3v2 The meaning of frame identificationDeclared ID3v2 FramesThe following frames is declared in this draft. 4.20 Aenc [[#sec4.20| Audio Encryption]]4.15 APIC [#sec4. Attached picture]4.11 COMM [#sec4. Comments]4.25 COMR [#sec4

WordPress Source code Compression optimization and the solution of common problems

Label:First look at the effect:It means to make your source code look crowded together, so that if others want to see your source code is not easy to understand, (of course, if others really want to see the words can also be done by some of the

String

Label:String is mainly used for programming, concept description, Function interpretation, usage detailed see the text, here Add two points: 1. The ansistring in Free Pascal can only be considered as a whole, many functions can not be used, even if

20145326 Network Security Defense learning platform-base off

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MIME TYPE

Label:What is MIME TYPE?MIME (Multipurpose Internet Mail Extensions) multi-purpose Internet Mail extension type. Is the type of file that sets the extension of an application to be opened by an app, and when the extension file is accessed, the

2016/4/14/22/40d

Label:DescriptionToday is Wednesday, the third day of the week. What's more interesting was that tomorrow was the last day of the year 2015.Limak is a little polar bear. He enjoyed a lot. Now, he's so eager to the coming year 2016.Limak wants to

Relationship and interaction between primary key and primary key index

Tags: primary KEY constraint IndexThe definition of a primary key: A collection of columns or columns that is used to uniquely identify a row in a table. Only one primary key is allowed on a table.When we specify a primary key in the database, it is

Serene Framework Official document translation (1-2 start, install and interface)

Label: 1. StartThe best and quickest way to serenity a hand is to use serene, which is a sample application template. You have 2 options to install the serene template to your visual Studio: Installing serene from Visual Studio Gallery

ERROR 1062 (23000): Duplicate entry ' 0 ' for key ' PRIMARY '

Label:Os:centos 6.3db:5.5.14Test Create Yoon Test table, no primary key, no index, the underlying data content is as follows:Mysql> select * from Yoon;+----+----------+------+| ID | name | user |+----+----------+------+| 1 | \ "" ##!aa | NULL || 2

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Label:Currently, programmers can only develop and test ASP. NET Web site programs through one of the following two Web servers:1. Visual studio comes with an ASP. NET Development Server (Webdev.exe).2. Windows comes with an IIS Web server.Each of

KVM Introduction (3): I/O full virtualization and quasi-virtualization [KVM I/O QEMU Full-virtualizaiton para-virtualization]

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