cortana skills

Skills and optimization of SQL statements learned by mysql, and skills of mysqlsql statementsI. use regular expressions in SQL Select name, email from user where email Regexp "@ 163 [.,] com $ "; The use of Regexp in SQL statements has a great impact on performance.2. Use the Rand () function to obtain random data Rand (); random number Function 1. Randomly sort mysql> select * from hello order by rand ();

Practical Android skills 21: Exploring Android prototype design tools and practical android skills Mobile developers, mobile product managers, and Interaction designers will make a series of sketches after they have the idea of the product, and then repeat the improvements until they are satisfied. This sketch is the prototype design, which is very important in the initial stage of product design. It is t

[Unity skills] Optimization Technology in Unity and unity skills Optimization Technology Preface This article is based on a series of tutorials by Digital Tutors and summarizes the extended content ~ Digital Tutors is a great tutorial website. It contains many materials in the multimedia field and is very cool! In addition, we also refer to a tutorial in Unity Cookie. There are many other references in the

Xcode debugging skills and Xcode debugging skills Programmers spend a lot of time on debugging in daily development, and Xcode is inevitable for iOS development. This blog mainly introduces several methods in Xcode that can greatly improve code debugging efficiency. "If debugging is the process of removing bugs, then programming must be the process of putting them in ."-- Edsger W. Dijkstra Add conditions

Summary of the application skills of the apply method in JavaScript and the apply Application Skills Preface Recently, I have been looking at the JavaScript design patterns, some of which are clever functions. Therefore, after some modifications are recorded here, some interesting functions written by myself are added. It is convenient for you to use it later. Let's take a look. 1. call using apply Function

Underline in python skills (2) and underline in python skills Python uses underscores (_) as the prefix and suffix of variables to specify special variables. _ Xxx cannot be imported using 'from module import *' _ Xxx _ system definition name _ Private variable name in xxx class Core style: Avoid using underscores as the start of variable names. Because underlines have special meanings for the interpreter

Summary of common Python crawler skills and python crawler skills Python has been used for more than a year. The scenarios with the largest number of python applications are web rapid development, crawling, and automated O M: I have written simple websites, automatic post scripts, email sending and receiving scripts, and simple verification code recognition scripts. Crawlers also have a lot of reusable pro

One of the Public Account promotion skills, public promotion skills Before talking about public account promotion techniques, we should first introduce a public account. By adding friends, search for "Mobile Phone repair", ranking first in the certification service number. This service number is growing very fast. From registration to certification going online, it took less than two weeks in total, and in

JQuery performance optimization skills analysis, jquery performance optimization skills This article gives a detailed analysis of jQuery performance optimization techniques. Share it with you for your reference. The specific analysis is as follows: I. Use the latest jQuery class library The new version of jQuery will fix bugs and optimize bugs compared with the previous version. However, after changing the

Collection of common jQuery front-end skills and jquery front-end skills The console. log () is used for debugging, which is much easier than alert. Jquery is prone to errors: When an element is spliced, the pre-added element is used before it is added to the DOM. The data obtained by ajax is not loaded with html elements. The following describes how to use pre-assembled elements. Copy codeThe Code is as fo

Ten JavaScript skills per day (2) and javascript skills 1. Non-Numerical Conversion UseNumber()Conversion: Undefined will be converted to NaN If the string starts with 0, the browser will ignore the leading 0 and will not convert it according to the octal If the string starts with 0x, the browser converts the string to decimal in hexadecimal format. If a string contains characters, all characters e

Android development skills-similar to the new version of QQ screen lock pop-up window, android development skills The new version of qq can display qq messages in the pop-up window under the screen lock. This function is also required for projects currently in progress. After a variety of experiments and data searches, the process is finally achieved, but there are some points to note. The following is the

The ten carefully organized items must know CSS + DIV skills and cssdiv skills. 1. Simplified css font rulesWhen we write a font style, we may write it like this. 　　 font-size: 1em; line-height: 1.5em; font-weight: bold; font-style: italic; font-variant: small-caps; font-family: verdana,serif In fact, writing in this way is completely redundant. I can only use font to write it. For exam

28 Seo skills that significantly improved keyword rankings: Keyword location, density, processing Keyword in the URL) Keywords appear in the webpage title (1-3) Keyword tags (1-3) Keyword appears in the description tag (the main keyword is repeated twice) Keyword appears naturally in the content Keywords appear in the first and last sections of the content A keyword appears in the H1 and H2 tags. Export link anchor text contains key

1. Never stop learning and reading Reading books, not just Web sites Reading is only for self-improvement, not for the next project Reading improves your foundation, not just the latest technology. 2. Work with people smarter than you. Working with people who are smarter than you or who are more experienced can give you a quick boost 3. Become a versatile Don't be overly obsessed with this, which may cause you to stagnate and hurt your job prospects. 4. Read and record other people's

This example describes the PHP image processing. Share to everyone for your reference, specific as follows: demo1.php demo2.php demo3.php demo4.php demo5.php demo6.php For more information on PHP related content readers can view the site topics: "PHP graphics and pictures Operating skills summary", "Basic PHP Grammar Introductory Course", "PHP Operations and Operator

In many cases, front-end developers use JS scripts to modify the Dom structure or style of pages, which may cause unexpected bugs for various reasons, such: the Code logic is complex, the processing details are forgotten for a long time, or the bug left by others is simply taken over. In this case, debug becomes a headache. I would like to share some JS debugging skills here, which can often provide better results for various intractable diseases.

Basic practical skills (04) --------------- inherit Virtual Methods and overwrite, graphic of actual military and boxing skillsI. Form2 inherits the two buttons of Form1 and has a virtual method. Result Ii. Code Form1 code Using System; using System. collections. generic; using System. componentModel; using System. data; using System. drawing; using System. linq; using System. text; using System. windows. forms; namespace inherits Virtual Methods and

The stored sub-pages can be iframe or frameset. This example describes the javascript parent and sub-page interaction skills. If you need a sub-page, you can refer to the next frame to store the sub-pages, it can also be frameset. The window object is a global object, and all functions and objects on the page are in its scope. 1. parent indicates the parent window. If the parent window has several layers of nesting, top indicates the top-level parent

Vmwarevm optimization skills and vmwarevm skillsIn vmwarevirtual machine (VMware Workstation or VMware Server), we can run multiple Guest OS at the same time, when multiple virtual machines are running on the same Host OS at the same time, the running efficiency and performance of the Host OS will be seriously affected. So how can we optimize virtual machines to achieve optimal resource utilization? In this article, we will introduce you to 10 current