MySQL

Yesterday encountered a problem, it is necessary to delete a table of duplicate data, and there is the hope that the ID of this list can be continuous, because once the duplicate record is deleted, as the self-increment key ID will be discontinuous,

(1) Nonsense is not much to say is the use of MySQL database when you can not input Chinese, the input of Chinese after the display is garbled!!(2 starts to solve the problem:First step: Find the directory where MySQL is installed to find the My.ini

Mysql> SELECT * from TableLIMIT5,Ten;//Retrieving record lines6- the //In order to retrieve all the record rows from an offset to the end of the recordset, you can specify the second parameter as-1: MySQL> SELECT * from TableLIMIT

There is a special rule in MySQL that column aliases are not allowed as query criteria. For example, there is a table below:SelectIdTitleConceptConceptlength,Adduserid,ModifytimeFrom Collections_wisdomModify the SQL as follows:SelectId+1 as

Use the command under Ubuntu:$:sudo apt-get Install mysql-server command installed MySQLVersion: Server version:5.7.13-0ubuntu0.16.04.2 (Ubuntu)Go to MySQL to add a user using command:mysql> INSERT INTO Mysql.user (Host,user) VALUES ("localhost",

1. Add MySQL UserUseradd MySQL2, decompression MySQL binary package to/usr/local/tar -xzvf mysql-5.6. -LINUX-GLIBC2. 5-x86_64. tar. gz-c/usr/local/3. Create a connectioncd/usr/local/Ln -S mysql-5.6. -LINUX-GLIBC2. 5-x86_64 MySQL4. Initialize the

#! /bin/bash# v.mysql-5.6.30-linux-glibc2.5-x86_64.tar.gz# only Install master mysql# time:2016-08-15# pkg dirpkg_dir= ' PWD ' # mysql base dirdata_dir= "/data/mysql_root/mysql" base_dir= "/usr/local/mysql" # create MySQL Group and Userecho " Start

Groupadd MySQLuseradd-g MySQL MySQLCd/usr/localTar zxvf/root/mysql-5.0.22.tar.gz # mysql source code package absolute PathCD mysql-5.0.22./configure--enable-thread-safe-client--with-unix-socket--with-mysqld-user=mysql--WITH-CHARSET=GBK--prefix=/ Usr/

Mysqld-the MySQL Servermysql-the MySQL command-line toolMysqlaccess-client for checking access privilegesMysqladmin-client for administering a MySQL servermysqlbinlog-utility for processing binary log filesMysqlbug-generate Bug ReportMYSQLCHECK-A

Background-7 Wide byte injectionLess-32,33,34,35,36,37 Six is all about the ' and \ ' filters, so we put them together for discussion.For the wide-byte injection of students should be a few of the bypass way should be more understanding. Here we

Example: two-machine hot standby (AB replication) for MySQLDB1 (Master) DB2 (Salave)Db1.josen365.netEth0 192.168.1.48/24eth0:0 192.168.33.48/24Eth1 192.168.100.48Db2.josen365.netEth0 192.168.1.49/24eth0:0 192.168.33.49/24Eth1 192.168.100.49The core

In the application of $mysqli, because there is no common to the data rollback, old forget, tidy up, make a record.$mysqli->autocommit (FALSE);//autocommit setting off$mysqli->query ("BEGIN"); The transaction begins, and then the following execution

SQL join is used to query data from these tables based on the relationship between the columns in two or more tables.Joins can be divided into inner and outer joins, and outer joins are left, right, and fully connected.Existing two table employee

MySQL user root password is a big loophole in the Internet, there are a number of ways to exploit this vulnerability, the general is to write an ASP or PHP backdoor, not only very troublesome, but also to guess the directory of the site, if the

Solution for garbled Chinese Characters in form input data in MySql MySQL causes Chinese garbled characters because 1. Problems with server settings, generally latin1 2. No encoding format is specified during table creation. Solution to Chinese

Detailed description of MySQL high-availability MMM construction scheme and architecture principle, mysqlmmm Let's take a look at the architecture, such: Deployment 1. Modify hosts Perform the same operation on all servers. Vim/etc/hosts 192.168.13

Summary of MySQL partitions and summary of MySQL partitions Preface Partition refers to dividing a large table into multiple smaller parts according to certain rules. The rule here is generally to use Partition Rules to split the table horizontally;

A MySQL bug about exists, MySQLexistsbug Today, I encountered a very strange problem about exists, The first statement is as follows: SELECT count(1)FROM APPLY tWHERE EXISTS ( SELECT r.APPLY_ID FROM

Detailed description of the JSON series operation functions in Mysql, detailed description of the mysqljson Functions Preface JSON is a lightweight data exchange format, which uses a language-independent text format, similar to XML, but easier to

Summary of common MySQL basic SQL statements and mysqlsql statements 1. Common commands Connect the local database to the remote database (172.16.xx.xx: 3306 ): mysql -h localhost -u root -p123 mysql -h 172.16.xx.xx -P 3306 -u root -p 2. DDL Data