MySQL

1. The contents of SC table are as follows:Mysql> SELECT * FROM SC ORDER by SID ASC;+----+-------+-----+-------+| ID | SID | CID | Score |+----+-------+-----+-------+| 1 | 10001 | 101 | 70 || 2 | 10001 | 102 | 80 || 4 | 10001 | 103 | 90 || 3 | 10008

Consider the following requirements, for a period of time, a period of time, take an average, all the average value out, how to do?Idea: In the stored procedure, splicing the SQL statement. The while loop adds a period of time, depending on the

Have a friend message, you need to monitor the TPS for a specified time, such as 9 to 18 in the morning, and write a method of TPS within 10 seconds. #!/bin/bashexport black= ' \033[ 0m ' export boldblack= ' \033[1;0m ' export red= ' \033[31m '

Service Mysqld Stop mysqld_safe–skip-grant-tables–user=mysql&//Skip Authorization form Mysql.user and Mysql.db Mysql-uroot Set Password=password ("yourpasswd"); There was an error because the –skip-grant-tables was added. mysql> Update

Now most of the environment that MySQL runs is on Linux, how to optimize on the Linux operating system according to MySQL, we give some general simple strategy here. These methods help improve the performance of MySQL.Gossip less, get to the point.

Earlier in the work, because the customer's disk space alarm did not pay much attention to the lack of space caused by the following possible MySQL problem1 MySQL process does not come up2 MySQL does not shut down properly and must be kill-93 MySQL

1. Install python2.7 please download and install it from guangwang2.2. Install Django. Download django-1.5.1 unzip, run python2.7 setup.py install3. Install MySQL using Yum installation.3.1 Run sudo yum install-y mysql-devel.x86_64 mysql-server.x86_6

1. Download http://dev.mysql.com/downloads/connector/python/because Python installs 3.4, you need to download the following mysql-connector-python:after successful download:2, install Mysql-connector-python, you will find the installation of silent,

Install 2 Windows Server servers, install MySQL Separately, configure environment variables, complete the installation confirmation in the CMD window can use the MySQL command Create a Sync account on the master server to ensure that the slave

1. Connect MySQL: Local mysql-u root-p remote mysql-h host address-u user name-P user password2. Password change: Format: Mysqladmin-u username-P Old password password new password3. Add User: Format: Grant SELECT on database. * To User name @ login

CMD view MySQL database table when found, unable to insert Chinese data, detected Chinese is also garbled.Method: Locate the My.ini file in the MySQL installation file, add: Default-character-set=utf8The following effects are modified:[Client]port=33

Description of the Oschina MySQL configuration file for sweet potato Open Source: [Client]password        = port            = 3306socket   &NBSP ;      =/tmp/mysql.sock# limit the size of packets received by MySQL server (this is the client incoming

First, Webxone problem: 1, the current stable version seems to be v2510;2, design webxone application, the window's "position" property can only be set to podesigned, and can not dynamically change the window size, otherwise in the browser display

First, the keyword: event two, Syntax: CREATE event? [If not EXISTS]//Create event_name if not present? On SCHEDULE schedle[on completion [NOT] preserve][enable| Desable][comment ' COMMENT ']dosql_statementDescription: The name of the 1.event_name

Since MySQL5.1.0, a very distinctive feature has been added – Event Scheduler (Scheduler), which can be used to perform certain tasks on a timed basis and can be seen as a time-based trigger.First, openEvent scheduling is turned off by default,

Concat is used to splice strings, such as Select Concat (RTrim (Vend_name), ' (', RTrim (vend_country), ') ') from vendors;Where RTrim is used to remove the right side of the space, concat in multiple strings, connected.In addition, it is usually

3.1 Databases and Data objects1. System Database INFORMATION_SCHEMA: Some database object information in the primary storage system, such as user list information, column information, permission information, character set

If your MySQL database is relatively small, we can export it every month. We can use it to recover quickly when there are some unrecoverable errors in this database.Linux complete export of the database inmysqldump–uroot–p--database Database name

Find the MySQL real data directoryShow variables like 'DataDir';+---------------+-----------------+|Variable_name|Value|+---------------+-----------------+|DataDir| /var/Lib/Mysql/ |+---------------+-----------------+Steps:Close Apache,tomcatTurn

9.1 Inserting data records1. Insert full or partial data records:INSERT into table_name (field1,field2,field3,... fieldn) VALUES (value1,value2,value3,... Valuen);Field parameters (field1,field2,field3,... fieldn) can be omitted when inserting