MySQL

There are several prerequisites for using the MySQL event feature:One: The version used must be 5.1 or above, because 5.1 support this feature laterSecond: Check if the event function is turned on:SHOW VARIABLES like ' Event_scheduler ';Show Off is

Inserting a record with the same primary key if a primary key is defined in the table when using the SQL statement to insert a data table inserts an error: Error code:1062. Duplicate entry ' XXXXX ' for key ' PRIMARY ' (primary key conflict)So we

Downloadhttp://dev.mysql.com/downloads/mysql/Select Linux-genericSelect versionwget http://cdn.mysql.com/Downloads/MySQL-5.5/mysql-5.5.39-linux2.6-x86_64.tar.gzAccording to the description of the Install-binary file, the default installation

1. Index function In addition to the ordered lookups mentioned above, the database uses a variety of fast location techniques to greatly improve the query efficiency. In particular, when the amount of data is very large and the query involves more

In the process of migrating a Web site, an error occurred while importing the phpMyAdmin exported database again using Navicat to another databaseThe error prompt is #1064-you have an error in your SQL syntax; ...The first analysis is a syntax

Mariadb Installation Method:①RPM Package:OS VendorMysqlUniversal binary Format② Source PackageCompile-mode installation mariadb:Compiling and installing MARIADBOne of the important characteristics of CMake is its independent of the source code

Today's online business encounters a problem because a table with a simulated self-increment sequence is locked and the business involved in the table is affected.On-Line conditions:1. This table has only one ID field.2. ID field as primary key

Install the MySQL installation bin directory first (for example: C:xxx\xxx\mysql\bin add environment variable)1. Enter net stop MYSQL5 or net stop MySQL under the Command line window2. Open a command-line window and enterMysqld-nt--skip-grant-tables;

Using the MySQL command line can achieve many of the features we need, but when using the MySQL command line, there is a problem when the MySQL command line to insert Chinese data or query the Chinese data garbled, or the display is incorrect.1, in

#-*-Coding:utf-8-*-# mysqltest.pyimport mysql.connectorconn = Mysql.connector.connect (user= ' root ', host= ' 127.0.0.1 ' , port= ' 3306 ', password= ' admin ', database= ' test_db ', use_unicode=true) cursor = Conn.cursor () # Cursor.execute ('

MySQL configuration for master-slave replicationOne, my.ini configuration file modification:1. Modify on the primary server:[Mysqld]#datadir =f:/application/mysql5.6/dataport=5616Event_scheduler=onMax_allowed_packet = 16MSkip-name-resolveSql_mode=

(This article is for your own note viewing only)Create a new database and import the data:mysql> CREATE DATABASE IF not EXISTS site_facelook CHARSET UTF8 COLLATE utf8_general_ci;mysql> use Site_facelook;mysql> set names UTF8;Mysql> source D:/wwwroot/

Upload DLL files to any directory, such as: D:/recycler/lib_mysqludf_sys.dllImport the DLL, import to the Windows or MySQL plug-in directory according to the version (typically execute SELECT @ @plugin_dir to see the plug-in Directory specific path):

Log in to your MySQL firstMysql-uroot-p The following message appears after successful loginWelcome to the MySQL Monitor. Commands End With; or \g.your MySQL connectionIDIs8Server Version:5.1. the-Log Source distributioncopyright (c) -, -, Oracle

　　Just show the user name and host toMysql> Grant all privileges on * * to [e-mail protected] ' 192.168.2.96 ' identified by ' Crmbbs ';This sentence means: Set an account for Wudaogang password for Crmbbs IP for 192.168.2.96 this IP to access

Modify MY.CNF[Mysqld] After addingAfter Default-storage-engine=innodbIf you start MySQL, you will encounter the following error:[ERROR] Plugin ' InnoDB ' init function returned error.[ERROR] Plugin ' InnoDB ' registration as a STORAGE ENGINE failed.[

View, Map Recognition I. View A view is a virtual table in a database. Its content is queried by the query statement. Like a real table, a view contains a series of columns and row data with names. However, a view does not exist in the database as a

Use leftjoin and innerjoin in SQL Left join on is a left Outer join. The data is based on the table on the left. The table data on the right is queried even if it is null, Inner join on means that the data in the tables on both sides of the left

Xin Xing uses mysqldump for Hot Backup The importance of backup is self-evident, especially for database administrators. There are many methods to back up data. I am not talking about them all here. Here I will talk about hot backup and cold backup.

How Xin Xing interprets the advantages and disadvantages of mysql stored procedures Common SQL statements must be compiled and executed before execution. stored procedures are a set of SQL statements to complete specific functions, it is directly