MySQL

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MySQL uses a number of different data types to break down into three broad categories: numbers, dates and times, and string types. Numeric data type: MySQL uses all the standard ANSI SQL numeric data types, so if you have a different database

From the command prompt, select the MySQL database: It is very simple to select a specific database mysql> prompt. Select a specific database, and you can use the SQL command. Example:The following is an example of selecting a database called

MySQL string intercept function: Left (), right (), substring (), Substring_index (). There is also mid (), substr (). where mid (), substr () is equivalent to the substring () letter LOCATE (SUBSTR,STR)POSITION (substr in str) Returns the

Using Linux+vim to write PHP is simply a pleasure. Here is my VIM configuration and installation of Plug-ins. 1. Download MySQL 5.5.28 source packDownload Address: http://www.mysql.com/downloads/mysql/#downloads In the MySQL download page

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Normal size Data backup restore we can use commands and scripts. 、 1. Use the command to implement the backup Database backup is important. If you do a regular backup, you can restore the data to the last normal state in the event of a system

A field that defines a unique constraint cannot contain duplicate values, you can define a unique constraint for one or more fields, so unique can be defined at the field level or at the table level, and the field on a unique constraint can contain

First of all, for things with higher accuracy, such as money, I would use the decimal type, do not consider float,double, because they are prone to error, The declaration syntax for a decimal column is decimal (m,d). In MySQL 5.1, the parameters

installing MySQLSince MySQL is not pre-installed in Mac OS X, it needs to be installed manually, and I chose MYSQL-5.5.10-OSX10.5-X86.DMG (http://dev.mysql.com/downloads/mysql/). Download MySQL and choose the right version.Run downloaded DMG file:

The MySQL tutorial database tutorial optimization is quite important. The most common and most needed optimization is limit. The limit of MySQL brings great convenience to paging, but when the amount of data is large, the performance of limit is

MySQL Tutorial group BY, sort the largest record of time in each record Select A.* from Test A,(Select Aid, Max (day) Max_day from test Group by aid) bwhere A.aid = B.aid and A.day = B.max_dayORDER BY A.install Desc Here is the test table, which

First, install the MySQL/Mariadb server and client, and connect to the server.In the command, uppercase letters are the keywords of SQL, and lowercase letters are their own attributes and data.0X00 connect to the databaseConnect to 127.0.0.1 using

Why is the master-slave architecture used?1. Server load balancing;2. Remote data backup through replication;3. Improve the availability of the database system;4. You can split databases vertically and tables horizontally ];Prerequisites for

Utf8mb4 is currently the largest character encoding and supports any text.Why is there UTF8MB4?Since utf8 has no problem in daily use, why utf8mb4? MySQL of earlier versions supports UTF-8 encoding. The maximum character length is 3 bytes. If a

There was an episode yesterday when the database was restored (it should be three o'clock in the morning:[Root @ site themes] #/usr/local/mysql/bin/mysql-uweb-p 'admin' web Warning: Using a password on the command line interface can be

Today, an ERROR message "ERROR 2006 (HY000) at line 534: MySQL server has gone away" is prompted when you import a database to a customer's website to migrate a VPS host, generally, this problem occurs when the database is too large and the