MySQL

Project with the Jdbc+mysql, the Bureau network to take data, data all normal, but to the server, once was goodDo not know why, the recent pass on the data, found that Android is not a problem, at least, there is no grammatical problems.After

database MySQL Automatic library sub-table backup script When we are in the company of database backup, the project is more, often do database and table additions, then weYou want the system script to automatically query the library and table

# # Part1: Authorization # Authorization is granting certain permissions to a user. # example 1: Grant the test user the SELECT permission on all tables of the ABC library. GRANT SELECT on ' abc '. * to ' test ' @ ' localhost '; # example 2: Grant

Master-Slave replication principle:For enterprise environments with large throughput, the master-slave replication technique is to create a database that is identical to the primary database server and can switch to continue working from the

Several ways to install MySQL:1, the operating system comes with the RPM package, 2, the official MySQL RPM package, 3, the general binary format; 4, source code compilationThe following is installed by the method of yard code compilation, is Http://

Add a PRIMARY KEY constraintALTER TABLE tb1_name ADD [CONSTRAINT [symbol]] PRIMARY KEY [Index_type] (Index_col_name,.......)ALTER TABLE user2 ADD CONSTRAINT pk_user2_id PRIMARY KEY (ID);Add a UNIQUE ConstraintALTER TABLE user2 ADD UNIQUE

A view is called a virtual table, and view is the result of a SQL query. It is easy to understand that view is the shadow or mirror of a table.The effect of two view:(1) Permission control: When you allow users to query only certain columns in a

1. An index is a directory of a book that, when queried for a row of data in a table, can quickly locate the row and return it as a result set based on the index. In the MySQL directory, there is a data directory that contains all the structures,

MySQL Common commands Summary1: Use the show statement to find out what database currently exists on the server: mysql> SHOW DATABASES; 2:2. Create a database Mysqldata mysql> CREATE DATABASE MYSQLDATA;

In order to learn the ORM, chose the EntityFramework, experienced three days and two nights of suffering, n times wrong, in the group of the help of master, finally succeeded, now will my mind history record down, one is let oneself have a record,

Using examples to illustrate how to view, delete, and add indexes, first create a table, as follows:Mysql> CREATE TABLE Stu (ID int,, name char (5),Key name (name),Unique key ID (ID));1. View the index of the table (two methods)(1) Show index from

There is a connection operation between the SQL statements, which must be used in some complex data operations. Simply put, the result of an SQL statement can be part of a connected SQL operation. SQL Structured query statements, subqueries refer to

Create Database test_db; Create a database named test_db Use test_db; Enter the TEST_DB database Show tables; See how many tables are in the database Drop database test_db; Deleting a database drop table test01; Delete a table Delete from

MySQL exported SQL statements may take several hours to import when processing millions data. Reasonable use of several parameters during export can greatly speed up the import.-e uses multi-line insert syntax that includes several values

Integer type: Type Number of bytes Default display width TINYINT 1 4 SMALLINT 2 6 Mediumint 3 9 Int 4 11

Data definition Language: language, referred to as DDL, including Createdrop alter statementsCreate table/database table name/database name;drop table name; (Both records and structure are deleted)Alter table name Add column adds a new list name

One. to install the MYSQL-CONNECTOR-ODBC driver Two. Configure the data source Computer Control Panel-management tools-Data source odbc-system dsn-Add-Select the MySQL ODBC Driver just installed Reference http://www.bitscn.com/pdb/mysql/201407/226195

MySQL data column type selection is a common problem when we design the table, below teaches you how to correctly select the MySQL data column type, for your reference to learn. Choosing the Right data column type can greatly improve the performance

1. Download MySQLhttp://www.mysql.com/downloads/2, Configuration My.ini# The MySQL server[Mysqld]#主目录Basedir = d:/mysql-5.6.26-winx64#数据目录DataDir = D:/mysql-5.6.26-winx64/data[Mysqlhotcopy] Interactive-timeout3. Configure Environment

EC2 enables MySql remote access and ec2mysql Remote Access Recently, MySql was installed on an Amazon cloud host and cannot be accessed remotely. After several pitfalls, the access was successful. Here we will record how to enable remote access