MySQL

If Table A's primary key is a field in table B, the field is called the Foreign key of Table B, table A is called the primary table, and table B is called from the table. Foreign keys are used to achieve referential integrity, and different foreign

First, introduce the type of indexMySQL Common indexes are: Primary key index, unique index, normal index, full-text index, composite indexPRIMARY key (primary key index) ALTER TABLE ' table_name ' Add PRIMARY KEY (' column ') unique (unique index)

Now the two servers used have installed MySQL, all in rpm packaging, can be used normally.In order to avoid unnecessary trouble, master and slave server MySQL version as far as possible to keep consistent;Environment: 192.168.0.1 (Master)192.168.0.2

Experimental environmentHostname IPMaster-db 192.168.0.1SLAVE-DB1 192.168.0.2SLAVE-DB2 192.168.0.3Amoeba 192.168.0.123I. Introduction of AMOEBAAmoeba is an open source project initiated by Ali technology Chen Siju, which is a distributed database

Three commonly used statements for inserting data in MySQL:Insert into indicates the data is inserted, the database will check the primary key (PrimaryKey), if there is a repeat error;Replace into represents inserting replacement data, PrimaryKey in

elect T0.accusation_des, T0.submit_time, T0.result, T0.handle_time, T1.content, t4.nick_name,t5.content , T6.ask_title, T7.state_name,t8.item_name,t9.school_name,t10.school_name,t12.school_name,t14.school_name FR OM wxcommunity.t_accusation t0 left

MySQL Study--mysql Architecture in-depth analysisMySQL ArchitectureConsists of the connection pool component, the management service and the? Tools component, the SQL interface component, the Query Analyzer component , the optimizer component, the

MySQL concat function is one of the many functions in MySQL database, the syntax and usage of MySQL concat function are described below for your reference and learning.How to use MySQL concat function:CONCAT (STR1,STR2,...)Returns the string that

MySQL deadlock checkI read a blog about the deadlock check today.Advanced InnoDB Deadlock troubleshooting–what SHOW InnoDB STATUS doesn ' t tell you, and what diagnostics you should be Lo OKing atOne common cause for deadlocks when using InnoDB

It is often necessary to return a result set in a stored procedure.  Mysql in direct use Select you can return the result set. and Oracle you need to use cursors to return the nodeFruitset. This point Mysql relatively convenient, the following code

MAatkitis a set of open source toolkits forMySQLhelp with the daily management of the WhichMk-table-checksumcan be used to detectMasterand theslavethe table structure and data are consistent. At the same time, throughMk-table-synctool to repair

CentOS 7.1 VersionView Firewalld[Email protected] sysconfig]# systemctl status Firewalldfirewalld.service-firewalld-dynamic Firewall daemonLoaded:loaded (/usr/lib/systemd/system/firewalld.service; enabled)Active: Active (running) since six 2015-07-04

Directory:　　First, Introduction　　Second, install MySQLThird, login MySQLIv. several important directories of MySQLFive, change the login password　　Six, start and stopSeven, change the MySQL directory　　Viii. common operations for MySQL　　Ix. adding

Recently in the public development, the use of Sina's servers, as well as the database provided by SinaThe databases provided by Sina can be manipulated using the "constants" they provide:If the user wants the specific value of these constants, you

Today, when logging into the database server, the following error occurred:1 [[email protected] app]# mysql-uroot-p2'Character-set-client=utf8 'Check the next my.cnf configuration file, is in the client section under the configuration of such an

First of all, the MySQL character set problem. Windows can be modified by modifying the My.ini in the[MySQL]Default-character-set=utf8 //client's default character setEnter show VARIABLES like ' character% ' in the MySQL client tool;In this way, the

Add userInsert into Mysql.user (Host,user,password) VALUES ("%", "Shenen", Password ("123456"));Add all PermissionsGrant all privileges the fgame.* to ' shenen222 ' @ ' percent ' identified by ' 123456 ';Add query permissions to a specific

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's

Can be installed with PIPPip Install Mysql-pythonIf the following error occurs_MYSQL.C:£ º£ º error: My_config. h: There is no file or directory _mysql. C::: Error: MySQL. h: There is no file or directory _mysql. C: £º: Error: Mysqld_error. h:

LNMP environment setup-MySQL 1. Install MySQL root@kallen:~# apt-get install mysql-server-5.5 mysql-client-5.5 2.Add Users (1) Select a data tableStatement: use mysql;(2) Add a connection user account in the mysql user table:Here, do not directly