MySQL

2017-09-05 19:10:55First, the database definitionEssentially, a database is a collection of information that can exist for a long time, often for many years. Generally speaking, the term "database" refers to a collection of data that is managed by a

1. Launch Instances 3306 and 33072. Check the main library configuration[Email protected] 3306]# egrep "Log-bin|server|sock" my.cnfSocket =/data/3306/mysql.sockSocket =/application/mysql-5.5.32/tmp/mysql.sock#socket =/data/3306/mysql.sockLog-bin

Tag:mysql   root    password     Find the MySQL startup profile     windows The following is My.ini, Linux under the name MY.CNF, Linux below if there is no special directory specified, then my.cnf generally stored under

Tag:drop   plain   sel   xpl    Direct      Table name     auto    incr   tab    Table operations: 1. Table creation: CREATE TABLE if not EXISTS table_name (field definition); Example: CREATE table if not exists user (id int auto_increment,uname var

Single Field primary keyMySQL single field primary key I believe everyone is familiar with it. Is the primary key for the primary data row of a field, such as the following tableTable 'user' (int (all-in-one),key (user_id)); USER_ID as a

window7 download mysql above is troublesome, do not like, so instead of using virtual machine installed Ubuntu system, provide MySQL service.First step: Download VMware workstation12,The second step: Download the Ubuntu image, I use a 14.04 mirror,

Sometimes a complex query needs to create a view that simplifies the query. We can also wrap the view as an object so that the query can be encapsulated directly in Java as an object.The original table structureTo create a view statement:Create View

Http://www.cnblogs.com/zzwlovegfj/archive/2012/06/23/2559593.html******************************************************************Left JOIN connection:Select column 1, column 2, column n fromTableA left join TableB On tableA. Column = TableB.

#shell是如何操作mysql的?The shell operation of MySQL is actually through the MySQL command through the parameters to execute the statement, and other programs inside the same, look at the following parameters:-E,--execute=name execute command and quit.

First, table field optimization1. Integer type try to use TINYINT, SMALLINT, Medium_int instead of INT, and non-negative numbers to add unsigned2.VARCHAR length allocation should be reasonable, not too big3. The time field does not exceed 2037 years

1. Use the Explain statement to view the results of the analysissuch as explain select * from Test1 where id=1;Appears: ID selecttype table type possible_keys key Key_len ref rows extra columns.whichType=const means that it was found by index one

The RegExp function in MySQL can match regular expressions in peacetime when using SQL, and you can use the RegExp function to match the corresponding characters when using some query conditions, which can replace many of the SQL functions that you

MySQL statistics functionCount (): Statistic quantity;Max (): Statistical maximum;Min (): Minimum statistical value;AVG (): Statistical averages;SUM (): statistics and;Select Count (* from student;MySQL sort group by;The default is ascending

First, the basic principle of replication　　Slave will read binlog (binary log file) from Master for data synchronization　　Steps:　　　　For detailed procedures, see : http://www.cnblogs.com/luckcs/articles/2543607.htmlIi. Basic principles of replication　

SELECT ucentertdoulog.user_id, Ucentertdoulog.subject, ucentertdoulog.tdou,ucentertdoulog.created, ucentertdoulog.out_id, Ifnull (SALEORDER.ORDER_SN, 0) as ORDER_SN, ( SELECT SUM

Statement: The material used in this column is written by the VIP students of the Kay Academy, who has the right to be anonymous and has the final right to interpret the article; The Edith Academy is designed to promote students to learn from each

Views of Mysql and views of MysqlView operations: 1. view creation: create view view_name as query statement; 2. view: show tables; // show all tables and views show create view view_name; desc view_name; show table status from table_name like 'view

Amazon Aurora interpretation (SIGMOD 2017), using rasigmod Amazon published a paper in SIGMOD 2017, Amazon Aurora: DesignConsiderations for High Throughput Cloud-Native Relational Databases. for the first time, it publicly introduced Aurora's design

Mysql table operations and index operations, mysql IndexesTable operations: 1. create table: create table if not exists table_name (field definition); example: create table if not exists user (id int auto_increment, uname varchar (20), address

MySql database basic notes (1), mysql database basic notes I. Concepts of tables and databases What forms does a database manage data? Tables in life ----> tablesThe traditional databases use multiple rows and multiple columns. The header is