MySQL

1. (Access Account rights Control) dql-query (SELECT) dml-(insert update Delete) ddl-(CREATE table CREATE VIEW) dcl-(Grant)2. (Access address permission control) sudo yum-y in3. Installing Mysql:sudo yum-y Install Mysql-server, open/etc/my.cnf join:

MySQL database system is a typical application of C/S (client/server) architecture, which requires specialized client software to access MySQL database. The simplest and easiest to use MySQL client software in a Linux system is its own MySQL command

"Good to remember the star as bad writing", this sentence has been with me for many years, I think that was still my language teacher commonly used mantra.Time Flash 3 years passed. Previously just remember to see other people's Blog park, Time soon

Read Catalogue Introduction to a storage engine Two table Introduction Three Create a table Four view table structure Five data types Six-table integrity constraints Seven Modified tables ALTER TABLE Eight copy

The concept of the left outer connection does not say, this time say what is the query step between the two tables?For example SELECT ut.id,ut.name,ut.age, ut.sex,ut.status,st.score,st.subject_name from B_score_test St LEFT JOIN B_user_test UT On St.

Installing MySQL on Ubuntu is very simple and requires just a few commands to complete.1. sudo apt-get install mysql-server 2.  Apt-get Isntall mysql-client 3. sudo apt-get install Libmysqlclient-dev the installation process will be prompted to set

When working on a very large table, you might occasionally need to run a lot of queries to get a small subset of large amounts of data, instead of running these queries against the entire table, instead of having MySQL find the few records needed

MySQL optimistic lock summary and practiceOriginal address: http://chenzhou123520.iteye.com/blog/1863407The previous article, "MySQL pessimistic lock summary and practice" talked about the MySQL pessimistic lock, but pessimistic lock is not suitable

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. Try to avoid using the! = or <> operator in the WHERE clause, or discard the engine

In the process of deploying MySQL is generally used in the binary package, so when upgrading the MySQL version of the latest MySQL package is also extracted to basedir, of course, if there is no data in MySQL directly removed reinstall can also, in

UsepythonWrite a monitoringMySQLthe script, inZabbix WebAdd the Template:## First Use MySQLdb interface associated with the database. [[Email protected] python]# cat check_mysql_custom.py#!/usr/local/bin/python '] Author  = chenmingle "" Description:

1. Package used by Go connection database"Database/sql" "Github.com/go-sql-driver/mysql"2. Go to connect to a database 　The first is to open the database return value: 1. *sql. DB Database Connection index 2. Error code SQL. Open

First, the establishment of the principle of the table:1. Table optimization and type selection(1) Separation between fixed length and variable appearance.(2) According to the frequency of use to establish the main table and sub-table (the

Master 192.168.56.20 and new database from both DB1 DB2 DB3 (if the database is in use, need to be locked manually from the primary backup and then from recovery)mysql> CREATE DATABASE db1;Query OK, 1 row Affected (0.00 sec)Mysql> CREATE DATABASE DB2

Reprint: http://www.cnblogs.com/best/p/6517755.html1. Expressions and Conditional QueriesThe WHERE keyword is used to specify the query condition, in the form of the Select Column name from the table name where condition;To query all gender-based

1, to optimize the query, should try to avoid full table scan, first of all should consider the where and order by the columns involved in the index.2, should try to avoid the null value of the field in the Where clause to judge, otherwise it will

CentOS 7 Installation MySQL Reference documents Https://www.ytyzx.org/index.php/%E5%A6%82%E4%BD%95%E5%9C%A8CentOS7%E4%B8%AD%E5%AE%89%E8%A3%85MySQL Add Yum repository to CentOS 7Enter "https://dev.mysql.com/downloads/repo/

Mysql error: Statement violates GTID consistency, violatesgtid In MYSQL, when the TABLE creation statement is executed, create table aaaa as select * FROM menu: Error code: 1786Statement violates GTID consistency: create table... SELECT. Java

Analysis and functions of MySql foreign key constraints on CASCADE, set null, RESTRICT, and empty types MySql foreign key constraints: NULL, RESTRICT, no action, CASCADE, set null, and other types of analysis and interpretation. Master table,

Mysql user management and permission settings Command related to mysql user management and permission settings. User Management Mysql> use mysql; View Mysql> select host, user, password from user; Create Mysql> create user zx_root; Modify Mysql>