MySQL

Increase:All field names are specified in the INSERT statementSyntax:INSERT into table name (field name 1, field Name 2, ...) Values (value 1, value 2, ...) ）；1.1.2 Field name is not specified in INSERT statementIf you do not specify a field name,

MySQL master-slave principle is very simple, summed up:Only one master can be set from each.After the master executes the SQL, log the binary log file (Bin-log).From the connection master, and get Binlog from the master, save in local relay-log, and

1) Add three elements:1, to which table to add the row: Add to Class table2. Add a few columns (ID sname gender,company,salary,fanbu)3, respectively add what value (1, ' Zhang San ', ' male ', ' haha ', ' 6666.66 ', 666)INSERT into class (ID sname

Primary keyAs the name implies, the primary key, primary key, is in a table, has only one field, and the value inside has uniquenessCreate a primary keyCreate with TableThe system provides two ways to increase the primary key:1. Add the primary key

1. Turn on MySQL remote connection1, Sudo-i2, cd/etc/mysql/mysql.conf.d/3. Vim MYSQLD.CNF#bind-address = 127.0.0.1Remove the front # and save the exit.4,/etc/init.d/mysql restart2. Add authorized Users1. Log in to MySQL with the root usermysql-uroot-

"There is a concept called simultaneous execution in the SQL standard ."Simultaneous execution refers to the timing of the execution of the various parts of the same clause as distinct, such as the following SQL statementSelect ABS(-1),ABS(2); +-----

MySQL full backup + incremental backup Profile: Manage MySQL configuration file, open Binlog log for MySQL database: Log_bi n =/var/log/mysql/mysql_bin.log server-id = 1 (must

One, MySQL 5.6 >> MySQL 5.7Error message:Last_Error: ... The slave coordinator and worker threads are stopped, possibly leaving data in inconsistent state. A restart should restore consistency automatically, although using non-transactional storage

Tool Library InstallationPip Install PymysqlConnect to shut down the database and increase the deletion check operation#Import Pymysql LibraryImportPymysql#Open a database connection#parameter 1: Host + port number where database server

Brief introduction1 · Index and classification2 · Create and view indexes3 · The concept and characteristics of the transaction4 • Operation of the transaction5 · Summary Expansion : Before you begin to understand the index, learn to

1.1.Download:I downloaded the zip package for the 64-bit system:: https://dev.mysql.com/downloads/mysql/Download the ZIP package:Unzip after download: D:\ Software installation package \mysql-5.7.20-winx641.2.To Configure environment

1. View details of all current connections: Mysqladmin-uroot-proot processlist client use: Show full processlist2, view only the current number of connections (threads is the number of connections.): Mysqladmin-uroot-The proot status client uses:3.

1, install the service sidesudo apt-get install Mysql-server2. Install the Clientsudo apt-get install mysql-client3. Ubuntu installation Software1. sudo apt-get updateAccess each URL in the source list, read the software list, save to

After the MySQL database is familiar and installed, the basic operations of the database are described below, and all of the following database statements are executed in the "mysql>" operating environment.First, MySQL---additions and deletions to

One, error log parsing:(1) "ERROR" 1452: Unable to insert data in foreign key table without reference primary key1452: Unable to insert or update data for the reference primary key in the foreign key table. Because the Item_discovery.itemid field

First, let's meet the SQL statement.Select SUM (Money) from the account where friend= ' haha ';Multiple tables form a library, multiple libraries to database server management (e.g. MySQL server)There are multiple libraries under a single server,

mysql5.5 is based on table lock read and write blocking, in order to solve this problem there is a master-slave replication, read and write separate cluster settings.Three Certifications1. master-Slave synchronous authentication2, amoeba access to

---restore content starts---Loop looplabel:loop statement_list IFthen LEAVE label; END IF END LOOP label;View CodeRepeat cycleREPEAT END REPEAT;View CodeWhile loop while search_condition do statement_listENDwhile;View

Modifications to the table after creationThe ALTER TABLE statement is used to modify the table after it is created, using the following basic usage:To add a column:Basic form: ALTER TABLE name add list column data type [after insertion position];示例：

Non-stop lock table online master-slave configurationhttp://seanlook.com/2015/12/14/mysql-replicas/ Master never synchronizesHttp://www.rfyy.net/archives/2309.htmlhttp://blog.51cto.com/storysky/259280 About