MySQL

The problem is as follows:For example, the person table in the query SQL statement if the table name is lowercase, it will be reported that the people table does not exist.Because the table name of the MySQL database in the Linux environment is case-

1 What is the basic idea of a sub-database table?It is literally a simple way to store data that is stored in a single library on multiple libraries, storing data that was originally stored in a single table on multiple tables.2 Why should the basic

Apache and MySQL add to system service and set boot upApache1 cp/usr/local/apache/bin/apachectl/etc/init.d/httpd2 chkconfig--add httpdError occurred with service httpd does not support ChkconfigOpen vi/etc/rc.d/init.d/httpd Add (#!/bin/sh below)#

A friend of mine suddenly sent me a SQL statement and asked me all at once.I think this kind of grammatical wood has been seen. I checked, only to understand what the meaning of the original is the use of MySQL inside.SUM (IF (' hosts ') (state = 0,

CentOS 7 + MySQL 5.7.13 reset root password step:# vi/etc/my.cnf # [mysqld] under Skip-grant-tables content before adding ## Mysql-uroot-p Enter Enter continuously# use MySQL# Update Mysql.user Set Authentication_string=password (' Redhat ') where

1. Edit the MySQL configuration fileMySQL configuration file under Windows generally under the system directory or in the MySQL installation directory named my.ini, can be searched, Linux is generally/etc/my.cnf--Add the following to the [Mysqld]

WAMP Create a databaseSelect phpMyAdminSelect Users, add UsersFill in the database details, complete the Select the bottom right corner of the "execute"User added success2. Nodejs install MySQL DriverNPM install MySQL3 Database Operations

IsNull (expr)If expr is null, then the return value of IsNull () is 1, otherwise the return value is 0.Mysql>select IsNull (+);->0Mysql>select IsNull (1/0);->1The comparison of NULL values using = is usually wrong.The IsNull () function has some of

Due to the re-installation of the Wampserver, the problems encountered before all will appear again, then today encountered in the MySQL console, in the table input Chinese data, but there is a question mark:So this is related to coding, then we go

MySQL Advanced table: Join up and down table: Union #自动去重 (when two tables of data, there are duplicates will automatically go to the weight) UNION ALL #不去重例如: Select Sid,sname from Snameunionselect ti D,tname from Teacherselect sid,sname to

This is the basic MySQL operation under Python3 . Other types of database usage are basically the same. Is that the name of the library is different. Because the python authorities have long ago set up a database of third-party libraries as an

CentOS6 turn on MySQL remote access1. Open MySQL Access port 3306Modify the firewall configuration fileVi/etc/sysconfig/iptablesJoin Port Configuration-A input-m state--state new-m tcp-p TCP--dport 3306-j ACCEPTReload RuleService Iptables Restart2.

The source of this article: http://www.cnblogs.com/wy123/p/6979499.htmlThe show Profile command is used to track resource consumption information for executed SQL statements, which can help you see how SQL statements are executed and can be used as

(turn) operation dimension on MySQL database optimizationTransferred from: http://lizhenliang.blog.51cto.com/7876557/1657465A mature database architecture is not designed to be high availability, high scalability and other features, it is with the

The output of the Processlist command shows which threads are running and can check the current database's running state, using this command in two ways. 1 Enter the Mysql/bin directory under the input mysqladmin processlist;2 start MySQL,

good understanding of SQL statements:columns: Understanding the variables that can be calculatedWhere: Understood as an expression, put in a row to see if it's trueCheck out the results can be as a table to understand, select to apply select

This article translated from: https://dev.mysql.com/doc/connector-python/en/SummaryThis manual describes how to install and configure MySQL Connector/python,mysql Connector/python is a standalone driver for Python and MySQL services to communicate,

#!/bin/bash# Backup Database Hz Jshuabo sdhuaboname=$ (date +%y%m%d)/alidata/server/mysql-5.1.73/bin/mysqldump-u root-p123456 Hz >/root/sqlbackup/hz. $name. sql/alidata/server/mysql-5.1.73/bin/mysqldump-u root-p123456 Jshuabo >/root/

1. Describe the optimization techniques often used by MySQL. mysql comes with slow log analysis tool Mysqldumpslow, but no description. By analyzing the script, this paper introduces its usage. Slow log is a file written by MySQL based on the run

I. OverviewZabbix the MySQL plugin to monitor the MySQL database, but it is too primitive, for our DBA, the basic does not have any role, so need to do more detailed monitoring, and Percona has this detailed monitoring of the template and script,