MySQL

Enter installation directory .../bin/mysql.exe CD Replacement directory dir lists all files in the current directory The c:\vesa\...\a> angle bracket is expressed in the A folder of the C/vasa/. CD space ... Indicates an up-level directory

Creation of tables CREATE TABLE ' Lee ' ( ' id ' int ' () not NULL auto_increment, ' name ' char (#) DEFAULT null, ' birthday ' datetime D Efault NULL, PRIMARY KEY (' id ')) engine=innodb DEFAULT Charset=utf8 Data insertion:

Set up 2 test tables and create a unique constraint on the ID column. Mysql> CREATE TABLE test1 (ID int,name varchar (5), type int,primary key (ID)); Query OK, 0 rows affected (0.01 sec) Mysql> CREATE TABLE test2 (ID int,name varchar (5), type

Open Terminal Switch to the root directory[Shell@localhost ~]# Su-Uninstall CentOS's own Mysql5.0 before installing Mysql5.5.[Root@localhost ~]# yum Remove MySQLInstall CMake Download CMake Source Pack cmake-2.8.5.tar.gz[Root@localhost ~]# wget http:

Statistical averagethe SELECT AVG () from syntax is used to average statistics from data tables.Grammar: SELECT AVG (column) from Tb_name This SQL syntax is used to count the average of a numeric type field, and the AVG () cannot be

There are many kinds of programs, I would simply say here: 1. Into outfile Copy Code code as follows: SELECT * FROM MyTable into outfile '/tmp/mytable.csv ' FIELDS terminated by ', ' Optionally enclosed by ' "' LINES

Table structure: CREATE TABLE ' instance ' ( ' id ' int (one) unsigned not null auto_increment, ' timestamp ' int (a) unsigned DEFAULT null , ' CPU ' decimal (8,3) DEFAULT NULL, PRIMARY KEY (' id ') ) Engine=innodb; Statistics are

This article has shared several kinds of replication table structure, table data examples, details, please see below. 1. Copy table structure and data to new table CREATE Table New Table select * from old table This method copies all the contents

In the process of development, avoid encountering disgusting garbled, or a series of problems caused by garbled characters. Garbled is the character set reason in general and logic is not too much relationship, that is, the whole system big

You can specify in the configuration file the initial execution of the SQL file after MySQL startup, and its syntax is:Specify under [mysqld] or [Server]:Init-file=d:\mysql-5.5.28-winx64\abc.sql, with a specific SQL file value behindNotice that the

To summarize Lengbei in one sentence is to stop the database services, such as mysql,oracle, and then use a copy, package, or compression command to back up the data directory. If there is an exception to the data, you can restore it through backup

Introduction： Because the MySQL database is too large, the default installed/var disk can no longer accommodate the newly added data, there is no way, can only find ways to transfer the data directory. Let me organize the following steps to

I believe that we use MySQL have overweight experience, if the reload MySQL is basically in the last step through but, unless the operating system, the reason is that the system's registry is not deleted clean. Here are some of the lessons I've

MySQL implements synchronization of two tables through triggers Currently, the local test was successful. Suppose there is a table table2 (ID, val) under table table1 (ID, Val) under the local two databases A and b,a. Suppose you want the data to be

Start learning the database today, because I am not very cold to Microsoft, so do not use his home product originally wanted to install Oracle, but too big, look afraid for me this kind of like basics, MySQL is a good choice, about the big theory of

MySQL large table repeating fields How do I find it? This is a lot of people have encountered problems, below teach you a MySQL large table repeat field Query method for your reference. There is a large table in the database, and you need to find a

Workaround: The first step: to restore the database and tables are UTF8 format (recommended UTF8, of course GBK or gb2312 also line) Copy Code code as follows: CREATE DATABASE ' Shegongku ' DEFAULT CHARACTER SET UTF8 CREATE TABLE '

The situation is the case: there are now two tables, a team table and a people table, each people belonging to a team,people with a field team_id. The following is a table statement: Copy Code code as follows: CREATE TABLE T_team

Mysqltuner Download Address: Http://github.com/rackerhacker/MySQLTuner-perl Mysqltuner Use Method:Downloading and using Mysqltuner is actually a very simple process: wget mysqltuner.plPerl mysqltuner.pl If you ' d rather not invoke the Perl every

Note: the Row_count () in MySQL can return the number of rows affected by the previous SQL Update,delete,insert operation. Test on MySQL (database version: 5.1.22): 1. Create a database table: Copy Code code as follows: CREATE TABLE