MySQL

One, partition type 1. Range type (range partition) Partitioning by scope, giving each partition a range that must be contiguous and not repeatable, using the values less than operator What do you mean? Is the range type is a scope,

1th step, see if MySQL is installed under CentOSInput command: Yum List installed | grep MySQL2nd step, remove installed MySQLInput command: yum-y remove MySQLSeeing complete means success.3rd step, view MySQL in the Yum Library (not required)Input

First, insert the recordCREATE DATABASEMYDB; UseMYDB;CREATE TABLE IDENTITY(NAMECHAR( -)PRIMARY KEY, BIRTHDATETIME not NULL, HOMECHAR( -));CREATE TABLESTUDENT ( Number INT PRIMARY KEYauto_increment, NAMECHAR( -) not NULL, AgeTINYINT not NULL,

A stored procedure describes a stored procedureThe stored procedure contains a series of executable SQL statements stored in MySQL, which can be executed by calling its name to execute a heap of SQL inside it.Advantages of using Stored procedures:#1.

First, the databaseA database is a warehouse that organizes, stores, and manages data in accordance with its data structure . Each database has one or more different APIs for creating, accessing, managing, searching, and replicating the saved

Product List--Table "goods" DDL:CREATE TABLE goods (gidInt (one) is not NULL,namevarchar (DEFAULT) NULL,numsmallint (6) DEFAULT NULL,PRIMARY KEY ( gid )) Engine=innodb DEFAULT Charset=utf8;Order table -table "orders" DDL:CREATE TABLE orders (oidInt (

ObjectiveWe cannot use SQL queries to query only a simple, basic SELECT statement. If you want to query more complex information from multiple tables, you will use an advanced query implementation.Common advanced query including multi-table

Table is a good way to distribute the pressure of the database.Table, the most straightforward meaning, is to divide a table structure into multiple tables, and then, can be in the same library, can also be placed in different libraries.Of course,

If a commit is not executed in the stored procedure, the operations performed by the stored procedure are rolled back once the spring container has a transaction rollback. If the stored procedure executes a commit, the transaction for the database

MysqlKnowledge sectionSummary: MySQL is a real multi-threaded, multi-user SQL database system. With its high performance, reliability and ease of use, she has become the most popular database system in the server world. Prior to 2008, the MySQL

The list differs from the range partition, and each partition must be explicitly defined, and each partition is defined according to the elements of the column values in a group of lists.CREATE TABLE employees ( id INT NOT NULL, fname VARCHAR(3

The binary format is installed in the following ways:1. Query the local installation of MySQL database related packages (uninstall) Rpm-qa "mysql*" (CENTOS6) Rpm-qa "mariadb*" (CETOS7) 2. mariadb.org Download the source binary package with the Linux

Note: This article only records foreign key learning. At present, the database design is more inclined to not use foreign key constraints, but through the program integrity to achieve master-slave relationship.First, the foreign key conceptA foreign

Business data from the company headquarters, background data settings are exported by day CSV, but the analysis of the business needs to see the entire time trend, Excel has been dead, only on MySQL, with SQL statement query. In fact, the load data

Lab Environment:A total of 2 MySQL servers A and B, on the B remote backup a database on a, set up a database on a Google and Baidu, pay attention to the firewall on the 3306 port or shut down firewalls;Experimental topology:Experimental steps1) Set

Database name: visadb0905 visadb20180315[Email protected] ~]# mysqldump-u root-p visadb0905 > ~/mysql.sqlEnter Password:[Email protected] ~]# pwd/root[[email protected] ~]# ls1.sql anaconda-ks.cfg hs_err_pid24510.log install.log install.log.syslog

First, storage engine introductionThe storage engine is a table type, and MySQL has different processing mechanisms depending on the table typeSecond, the table introducesTable is equivalent to a file, a record in the table is equivalent to a row of

In the actual work, sometimes need to perform MySQL database import and import operations, but for large SQL file import, phpMyAdmin is not, there are too many restrictions, such as records, memory, etc.!Export command: A) export the entire

CentOS Release 6.5 (Final) x86_64Apache:wget http://archive.apache.org/dist/httpd/httpd-2.2.27.tar.gzTar CD./configure--prifix=/application/apache2.2.27--enable-deflate--enable-expires--enable-headers--enable-modules=

MySQL concat and group_concat usage, concatgroup_concat The examples used in this article are all executed in the following database table tt2:  1. concat () function 1. function: concatenate multiple strings into one string. 2. Syntax: concat