MySQL

Create a test data table firstCREATE TABLE Users (Username varchar (+) NOT NULL,Password varchar (+) not null) Charset=utf8;Inserting dataInsertinto Users values ("admin", "admin");Insertinto Users values ("Silence", "Wang Peikun");Use the following

First make sure that you have a MySQL-installed development packageUnder Ubuntu do the following command installation, other distributions please check it yourselfInstall Libmysqlclient-devThe sample code is as follows:#include

In terminal input sudo apt-get install mysql-server mysql-clientDuring this installation, you will be asked to enter the password for the root user (managing MySQL database user, non-linux system user), as required.In the terminal input

Logical backups are typically used for data migrations or data volumes, and logical backups are backed up by data exports.If you need to export all databases, the command is as follows:Mysqldump-uroot-p--single-transaction-a>all.sqlIf you want to

1. Environment variable setting,Mysql_homeD:\MySQL\mysql-5.6.23-winx64Then configure the%mysql_home%\bin in path;2.my.ini ConfigurationBasedir = D:\MySQL\mysql-5.6.23-winx64DataDir = D:\MySQL\mysql-5.6.23-winx64\dataPort = 3306Character-set-server =

Now with the development of the Internet, the magnitude of the data is also exponential growth, from GB to TB to PB. The operation of the data is also more difficult, the traditional relational database can not meet the needs of fast query and

Create a functionDelimiter//Create functionFunction_name ([Parameters])returnsReturn_typebeginDo your WorkEnd//delimiter; Description:1.//can be replaced with $$2the last sentence has a space between the delimiter and the semicolon.3Each parameter

(1) SQL Basic Query (2) MySQL Supported Data types Summary (3) MySQL operator (4) Common functions in MySQL (5) MySQL common storage engine (6) Character set in MySQL (7) MySQL index design and use (8) MySQL view (9) Stored procedures in MySQL and

CREATE TABLE ' uniontest ' ( ' id ' int (one) not null auto_increment, ' menuname ' varchar () DEFAULT NULL, ' url ' V Archar (+) DEFAULT NULL, PRIMARY key (' id '), UNIQUE key ' U_index ' (' menuname ', ' url ')) Engine=innodb auto_ Increment=5

two types of installation MYSQL the methodA. compile-free installation1. First find a directory such as opt This catalog download MySQL installation package:[Email protected] ~]# cd/opt2. After entering, use wget or WinSCP , RZ various ways to Tar

1.mysql is an open-source relational database management system.2.mysql Login/exit: MySQL parameter: mysql-u root-p-p3306-h127.0.0.13.mysql Landing some parameters meaning:-u: User name,-P: User password,-P: Server port number,-H: Server address-D:

Initializationmain |-mysqld |-my_init // 初始话线程变量，互斥量 |-load_defaults // 获取配置 |-init_common_variables // 初始化变量 |-init_server_components // 初始化插件 | |-plugin_init | | |-plugin_initialize |

Read large files to mysql At first, I used the java Read File Processing format and stored it in the database. After running the command, I found that the efficiency was too low and too low. 4G text and more than 40 million lines. It was estimated

MySql Common commandsMysql Common commandsI haven't been writing a blog for a long time. It's time to write a summary of what I 've learned recently.Today, we will summarize some common mysql commands:Login: mysql-uroot-p-P3306-h ---- (-u indicates

Mysql Quick Start 1. Download and decompress$ Wget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-5.5.42-1.el6.x86_64.rpm-bundle.tarExtract the following files:$ Tar-xvf

[Access the MySQL server]To access a MySQL server, you must use a user account to log on to it. Each MySQL user account has many related attributes, such as the user name, password, permissions, and resource restrictions. "Permission" defines what a

How to uninstall mysql in linux1. Check whether mysql is installed before. Run the: yum remove mysql * command to uninstall mysql and related components. Command: rpm-qa | grep-I mysqlAs shown in: Note:MySQL-client-5.5.25a-1.rhel5MySQL-server-5.5.25

Mysql study Note 1 Database Operations 1. Create a database Create database databasename Return Query OK Error 1007 is returned if an Error occurs. 2. view all databases Show databases Note: It is databases, plural 3.

Mysql study note 2 (Table constraints) Operation table Constraints Integrity is the accuracy and consistency of the index data, and integrity check is to check the data accuracy and consistency. The mysql database management system provides a

A mysql query ProblemYesterday I wrote a complicated SQL statement. The following figure is shown:The required data now obtains the id and name fields from the product table, the quantity and totalMoney fields from buy_contract_Item and