general, MySQL chooses one of the indexes, and name is more likely because MYSQ will count the repetitions on each index and choose a field with a low repetition level. Another age index is not used, but there is also the overhead of maintaining the index, so the age index does not need to be created.B. Federated index of name and ageThis index is the best fit, and MySQL will use this index directly. However, the cost of maintenance is larger relativ
People who have used the Linux system know that the Linux system view user is not the same as Windows, the right mouse button to see my Computer properties, and then look at the computer users and groups. So what do you do when looking at all the users in the Linux operating system? With the command. In fact, it is easy to see which users are in the Linux system with the command.1. View all users in Linux(1
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the static member function of the class brings what benefit and should be used at what time. Tags: math design pattern Algorithm API Programming store 2011-10-13 18:15 3382 person reading reviews (0) Favorite report Category: C/C + + programming (7)
When the behavior of a function is consistent for all derived classes, it can be declared as static.
The function o
What are some of the techniques commonly used in Photoshop? 1. Quickly open file Double-click the background space in Photoshop (the default is the gray display area) to open the Browse window for the selected file. 2. Change the canvas color freely Select the Paint Bucket tool and hold down SHIFT and click on the edge of the canvas to set the canvas background to the currently selected foreground c
Today, Qingdao SEO received a single, in the communication with customers, the customer specifically stressed that do not use black hat means to improve the site rankings, said that the site will be K, I told him black hat means can be used, but to be divided, to master good skills ... Therefore, today's Qingdao SEO for the use of black hat means to do the optimization rankings to talk about their own views.
The concept of "black hat" is not said her
What if the network cannot be used after the virtual machine is installed WIN8 system?
Workaround:
1, please confirm the use of the latest version of the virtual machine, not to update, for example, VMware, starting from the 9.0 version to support the creation of Windows 8 system virtual machine;
2, the virtual machine is also to install the drive, so must be installed with the network card driver;
3,
This article mainly describes the HTML I tag introduction, as well as the use of HTML I tag introduction, and finally my personal summary, then let's take a look at this article
First of all, what do we say about HTML I tags? Let's take a look at the introduction of the I tag:
Use the
Tip:,
Tip:
Note: Because I also is the abbreviation of icon, like bootstrap some popular frame, also often use
Next, let's talk about how to use the HTML I tag:
T
Help me to see what PHP framework yindiandai_com is used for development. thank you for your help. Is this website developed using the thinkPHP framework? Thank you.
Yindiandai.com
Reply to discussion (solution)
Should not be
Should not be
Can you tell me what PHP framework is?
I think his layout style is similar to dede.
Diyou P2P smarty
Diyo
I know less about the development of the service side, do not know what the heroes recommend to learn what technology, read what books, or good advice?
And what technologies and frameworks are used in the current mainstream app service, and
New users ask the old question: What is PHP code used for debugging? What tools are used for PHP code debugging? I have mentioned var_dump on the Internet, but I don't know how to use it. is there any simpler method?
I am a newbie. please be sure to give a detailed answer. Thank you very much.
Reply to discussio
What is the difference between a vswitch and a vro? Can a vro be used as a vswitch ?, VroI often see some network friends asking about the difference between a vswitch and a vro. In fact, if you have used both a vswitch and a vro, you should know something about it. For everyone, the biggest difference between a vswitch and a vro is that a dial-up Internet access
we must search for known signatures.
Thus, unlike what exactly believe, signatures are still being used to detect these complex threats. The special support from emulation gives time for the virus to reconstruct itself in memory. Optimizations
At this point, you may be wondering how antivirus products scan a file so fast even when they have to search for thousands of signatures. there are several answers
simple with as few things as possible."On the other hand, 2008 was a dividing line for startups (two years later, Amason Web Service released the EC2 Compute Cloud), and GitHub could use the cloud for the first time without investing in infrastructure. But, without that, the founders of the company and the engineers they hired have drawn a technical stack sketch, and through the chat tool Hunt purchased a series of creative system management, software deployment Tools, and basic IT operations o
day (column) = ...), MySQL will not be able to use the index
13. In a join operation (when data needs to be extracted from multiple data tables), MySQL can use the index only if the data type of the primary key and foreign key is the same, otherwise the index will not be used in time.
14.explain can help developers analyze SQL problems, explain shows how MySQL uses indexes to process SELECT statements and join tables, helping to select better indexes
I have learned about soap before, But I seldom use it. I have found it in projects, but I have never actually used it. Is it still widely used? What is the main application scenario? I have learned about soap before, But I seldom use it. I have found it in projects, but I have never actually used it. Is it still widely
If the initialization process of a variable is complex but often used, what file does it usually save? Is it a. inc. php file with the same name? Or what other files are saved ?, The variable you are talking about is whether the user shares it or not. I don't quite understand. Generally, I only save the class definition as a file ., If a variable is often
What should I do if I don't remember the input method that comes with Win10? How can I solve the problem of non-memorizing frequently used words in the micro-soft Pinyin input method ?,
What can I do if I share Win10 built-in Input Method with no memory? How can I solve the problem of non-memorizing frequently used wo
HTML5 now more and more fire, many people want to learn HTML5, but HTML5 than the old version of the new form elements, now let's look at what the new form elements. HTML5 What are the new commonly used form elements? How are they used separately?
This chapter describes the following new form elements: Datalist;keygen
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