MySQL

baktime=$ (date +%y%m%d%h%m%s) find/usr/local/auto_databasebak-mtime +4-type f-exec/bin/rm {} \; /usr/local/mysqlmysql/bin/mysqldump-h127.0.0.1-uroot-ppwd--opt-r--single-transaction xj_gameserver | gzip >

1.mysql methodQuery the parent company of the departmentCREATE FUNCTION' Querycompanyid ' (areaidVARCHAR( -))RETURNS varchar( -)BEGINDECLAREStempVARCHAR( -);DECLAREStempchdVARCHAR( -);DECLAREDepttypeINT;SETStemp=Areaid;SETDepttype= 0; whileDepttype!=

Perform mysqldumpslow–h to view help information. Main introduction Two parameters-S and-t-S This is a sort parameter, optional:Al: Average lockout timeAR: Average number of returned recordsAt: Average query timeC: CountL: Lockout timeR: Return

Delete from studentwhere not in (Selectmin from Group by name,stuid,subid,subname,score);When executing this statement in MySQL, an error occurred: You can ' t specify target table ' student ' for update in FROM clause;The reason is that the

Data is the most core asset in any company, and regular backups are done to ensure that the database is in a timely fashion to roll back to the nearest backup point, minimizing the lossThis article will be two parts to explain: 1, regular backup of

Today, operation and maintenance of the data show added processing identity sorting function, see the code found that the original order by, is in reverse order of the ID, it is necessary to sort two fields at the same time.Added a parameter to try,

1.View Tool windows-database;2. Add a data source;3. Configure the database driver information;4. Set the driver file, tick "Use provided driver MySQL connector/j[latest]", configure complete click "Apply", or add the driver file yourself, add the

1. Outline WHERE-Learn how to use WHERE clauses to filter Row records based on specified criteria. And operator-describes how to use AND operators to combine Boolean expressions to form complex conditions for filtering data. The OR

When you delete a table or a piece of data in MySQL, it appears[ERR] 1451-cannot Delete or update a parent ROW:A FOREIGN KEY constraint fails (...) This is because the foreign Key association is set in MySQL, resulting in the inability to update or

Fifth. Permission system in MySQL databaseMySQL database service is a white list of permissions policy, that is, explicitly specify which users can do what, but not explicitly specify what some users can not do, the authentication of permissions is

MySQL 5.6.1 added the spatial data support function, added the st_* correlation function, can easily calculate two geographical coordinates point distance.The following example: calculates the distance of the perimeter coordinates by my coordinates

#!/bin/Bashsql_host=localhost #mysql hostsql_user=Root #mysql username#sql_passwd=1&$]|n". J+[[email protected] #User passwordSql_passwd=123456#User passwordsql_db=$(Date+%y%m%d) #database Namebackup_path=/data/mysqlbak #set Slave backup

Linux version: CentOS7 64-bit1. Download the installation package "mysql-5.6.33-linux-glibc2.5-x86_64.tar.gz# Install dependent yum-y Install Perl perl-devel autoconf Libaio2. Move the downloaded installation package to/usr/local/.3.

FTP is a file transfer protocol, to implement this protocol, you need to install a number of appropriate services and tools. In the client needs to install the connection tool, our common Client Connection tool has Ftp,lftp,wget,curl, etc., on the

Personal encounters with problems:I bought the cloud host one months ago, the UI picture is good, the front end is also written, PHP How to develop also think well, the result, the installation of Apache is successful, MySQL seems to be installed

Mysql user permission settings, remote access settings, set remote access from a fixed ip address, set root users to be unable to remotely access the mysql database, mysqlrootFor mysql user management, Note 1. Create a new user after logging on to

Mysql installation configuration, mysql L download the compressed package: Official Website: https://dev.mysql.com/downloads/mysql/5.1.html#downloads Step 1: Decompress the downloaded package to the directory you want to install Step 2: Go

Tens of millions of mysql Data Tables, several suggestions for creating tables and Field Extensions, and several mysql I. Overview When designing a system, we need to consider the amount of data in the table after the system runs for a period of

MySQL warning WARN: Establishing SSL connection without server's identity verification is not recommended. solution, Success loading Mysql Driver!Mon Apr 04 15:43:00 CST 2016 WARN: Establishing SSL connection without server's identity verification

Query and optimization of 10 million orders in mysql at a time, and summary of mysql orders at a time 　 The company's order system has a large daily order volume, with a large amount of table data exceeding 10 million. Company SQL optimization is