to use if

ObjectiveThere was no blog for a while, all day busy, to work, recording courses, happened recently a relatively idle time, to get the MySQL database.About MySQL database, here do not do too much introduction, open source, free and other features

Explain usageEXPLAIN tbl_name or: EXPLAIN [EXTENDED] SELECT select_optionsThe former can draw a table of the field structure and so on, the latter is mainly to give some relevant index information, and today the focus is the latter.Example

1, what is the MySQL execution plan to have a better understanding of the implementation plan, you need to first have a simple understanding of MySQL infrastructure and query fundamentals. MySQL's own functional architecture is divided into three

1, what is the MySQL execution plan to have a better understanding of the implementation plan, you need to first have a simple understanding of MySQL infrastructure and query fundamentals. MySQL's own functional architecture is divided into three

The explain command is the first recommended command to address database performance, and most performance issues can be easily resolved with this command, explain can be used to see how SQL statements are executed, to help select better indexes and

Http://www.cnblogs.com/kerrycode/p/4723637.htmlYum is the abbreviation for Yellow Dog Updater modified, originally developed by the developer Terra Soft, a release of Yellow Dog, written in Python, then called yup (Yellow Dog Updater), followed by

If conditions are determined to meet different conditions and perform different operations, we only need to learn programming and know the role of if. Let's take a look at how to use if in the mysql stored procedure. Today, let's talk aboutMysql

Do you know how many browsers are available in the world? In addition to the four well-known browsers, IE, Firefox, Opera, and Safari, there are nearly browsers in the world. In front-end development of websites, browser compatibility problems have

Let's start by pasting the previous code and reviewing the functionalityImport Randomsecret=random.randint (1,100) #生成随机数 #print (secret) time=6# guess number of times guess=0# input number minnum=0# minimum random number maxnum=100 #最大随机数print ("---

This section describes how to use ifesle in the SQL Server Stored Procedure for your reference. There are two tables in the database. The primary key of Table A is automatically increased and the foreign key of Table B is allowed to be empty. Now,

Document directory Add a MySQL database Add a java db (Derby) Database Download Ruby support If you have not installed the netbeans 6.0 IDE, open the netbeans ide 6.0 download page and download the IDE versions that contain Ruby support. If you

What about Android and iOS? Which one should I invest in first? I have been asked this kind of question many times. I just need to consider the IOS version for my project. I simply did some research, so I had this article (this article does not

The switch can only compare values or characters, but do not think that it is not useful if so. If appropriate, it is more efficient than if Else. The syntax structure of the switch is as follows: Switch (variable name or expression ){ Case must

Reference: http://hi.baidu.com/lpf2008007/blog/item/a3fa9a3928bcd9f13a87ce8d.html 1. If errorlevel tests the return status of the previous program, if the return status of the program is large or equal to the value described, execute the doscommand

I recently started to learn about linux Command operations and encountered problems when I used the 'useradd' command. I want to add a username command named user1, which should be 'useradd user1', but the prompt "bash: useradd: command not found"

This article from: http://www.cnblogs.com/wangiqngpei557/archive/2011/06/27/2091421.html     We continue to learn about. Net interoperability. Previous ArticleArticleWe introducedCodeHow to interoperate with the non-hosted code C ++. If you

This article from: http://www.cnblogs.com/laoai/archive/2011/03/07/1974209.html     1. Make the form appear at the specified position at startup Form1.startpositionManualCenterscreenWindowsdefaultlocation

1. When passing an array in a function Using return is more efficient than using global For example Function userloginfo ($ usertemp ){$ Detail = explode ("|", $ usertemp );Return $ detail;}$ Login = userloginfo ($ userdb );RatioFunction

First look at the parameter Introduction Format Option File Description Introduced -- Auto-generate-SQL Auto-generate-SQL Generate SQL statements automatically when they are not supplied in files

In front-end development of websites, browser compatibility problems have left us in a hurry. Chrome's birth does not know how much trouble we need to add. Browser compatibility is the first problem to be solved by the front-end development