MySQL

语句如下： varResumelist =db. Channelresume.where (model); varGroupvalues = resumelist.groupby (t =New{t.agentid, t.agentname}); varStatistics = groupvalues.select (c =NewResumestatisticsviewmodel () {Date=Datespan,

The first step: vim/etc/mysql/my.cnf found bind-address = 127.0.0.1 comment out this line, such as: #bind-address = 127.0.0.1 or instead: bind-address = 0.0.0.0 Allow any IP access; Or specify an IP address yourself. Restart

1. Create an employee table (and indicate that the character set is UTF8)Drop table if exists employee;CREATE TABLE Employee (ID int,Name varchar (20),Gender varchar (6),Birthday date,Entry_date date,Job varchar (30),Salary float (5,1),Resume text);2

1. Installation of MySQL under Mac: http://my.oschina.net/joanfen/blog/171109 2. Before using MySQL, make sure that the MySQL service in "System number Setup" is turned on 3. Open "Terminal", enter "Mysql-uroot-p" and enter the password you

Set the shared package address 192.168.80.10Setenforce 0Service Iptables Stop1. Sharing PackagesMount.cifs//192.168.80.10/r/media/Anonymous access to shared folderscd/media/LS to see if the mount is successfulTar xzvf

1. Inner connection (natural connection)2. External connection(1) Left outer connection (the table on the left is unrestricted)(2) Right outer connection (no restriction on the right table)(3) Full-outer connection (no restriction on both the left

1. Open a Command Prompt window, where the command prompt window itself has a character set that is viewed by right-clicking on the title bar of the command Prompt window and selecting the default value - Options - The default code page allows you

If a field of one entity points to the primary key of another entity, it is called a foreign keyThe entity that is pointed to is called the primary entity (the primary table), also called the parent entity (the parent table).The entity that is

At the command line MySQL data export has a very good command mysqldump, it has a lot of parameters, you can view:MysqldumpMost commonly used:Mysqldump-uroot-pmysql databasefoo table1 table2 > Foo.sqlThis allows the database Databasefoo table Table1,

The tangled process:Mysql> SELECT * from role GROUP BY role_name,deleted;+---------+-----------+---------+| role_id | role_name | deleted |+---------+-----------+---------+|2 | Xue | 12 || 1 | Zhao | 12 || 3 | Zhao | 13 |+---------+---

Modify# cd/usr/local# mkdir db (build MySQL database new storage directory)# Cp-r/VAR/DB/MYSQL/VAR/DB/MYSQL_BK (back up the default MySQL database)# cp-r/var/db/mysql/usr/local/db (copy MySQL database to new storage directory)# mysqladmin shutdown

1. Connect MySQL database:#mysql-H 1.1.1.1-uroot-p Zabbix2. mysql Password changemysqladmin command format: Mysqladmin-u user Name----old password Password new password (password function)2) forgot root password# vi/etc/my.cnf  Restart Mysqld3.

Official information: Http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html#resetting-permissions-unixThere is also a reference to MySQL installation, with Python-mysql installation blog http://hearrain.com/2011/01/498According to

1. Go to the MySQL bin directory and execute Mysql.exe650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/41/1F/wKioL1PQ0CmBa-rNAAEKmXD_VxY144.jpg "title=" 4.jpg " alt= "Wkiol1pq0cmba-rnaaekmxd_vxy144.jpg"/>2. Use Mysql-uroot-p to log in to

Today, the database file Import encountered a problem: the ' InnoDB ' feature is disabled;you need MySQL built with ' InnoDB ' to the It wo Rking. The problem to Baidu in a paste, immediately can search the

A character set is a set of characters and encodings, which are a set of rules for comparing character sets.So the character set has two parts that make up the character set and the corresponding encoding set. For example, now there are these

Mysql in and EXISTS optimization example introduction, mysqlexists Optimization Principle: small tables drive large tables, that is, small datasets drive large datasets. ############ Principle (RBO )##################### Select * from A where id in (

View mysql database version summary, mysql database When you take over the management of a mysql database, you first need to check the maintained mysql database version. When a developer asks you about the mysql database version, you forget it

Export mysql Data to excel and related computing, and export mysql Data After mysql queries the data, you can select to export the file as a csv file by default. If the data type is integer, you can add multiple values in CONCAT ('\ '', filed) to

[Note] InnoDB memory allocation and innodb Memory Allocation Original article: http://www.mysqlperformanceblog.com/2006/05/30/innodb-memory-usage/ There are many problems related to how InnoDB allocates memory. Here I try to explain the memory