MySQL

mysqld--install Installing MySQLnet start MySQL open MySQLMysql-uroot Landing native MySQLnet stop MySQL stop MySQLMysql>\q quit MySQLMysql\exit quit MySQLMysql\quit quit MySQLMySQL--remove removal mysqlCLS Clear ScreenColor 1f White-white cmd on

Fatal error:uncaught exception ' pdoexception ' with message ' sqlstate[hy000] [+] mysqlnd cannot connect to MySQL 4.1+ u Sing the old insecure authentication. Administration tool to reset your password with the command SET password = password ('

There is a table that represents the region, and the table structure and data is probably the following table. id" name parent_id 1 China 2 Guangdong

Recently there's a business that writes data to a table in a MySQL database,The amount of data per day is not very large, and the business is always dependent on the last 1 days of data;But with the accumulation of time, the data entry in the

The solution is based on the following URL:http://blog.csdn.net/stail111/article/details/5640109Questions: MySQL database, if the date character blank in the database is a value of ' 0000-00-00 00:00:00 ' when queried, return: Cannot convert value '

Tag:mysql   httpd24    called error     # vim /etc/httpd24/httpd.confpidfile  "/var/run/httpd/httpd.pid" LoadModule php5_module         modules/libphp5.soDocumentRoot  "/web/htdocs" # vim /web/htdocs/index.php        # Inside the content is excerpt

1. Join keyword is to link multiple tables togetherBoth on and where are conditions, but the objects are different1.1. The keyword on refers to how to connect two tables, such as: on a.name = B.nameis a row-by-row comparison, and then joined

Introduction to Stored ProceduresA stored procedure is a set of SQL statements that are compiled and stored in a database in order to accomplish a specific function. The user executes it by specifying the name of the stored procedure and giving the

The first is to attach the OpenStack document, as an example to explain why the right to the% but has been reported permission error! mysql-u Root-pyunjisuanCREATE DATABASE Keystone;GRANT all privileges the keystone.* to ' keystone ' @ ' localhost '

In MySQL learning note (ii), the basics of MySQL are described, and now talk about the core part of MySQL, query: SELECT statement.1. query all fields: SELECT * from ;2. Query the specified field: SELECT from ;3. Specify record query: SELECT from

#1 Install related PackagesYum-y Install libmcrypt-devel mhash-devel libxslt-devel libjpeg libjpeg-devel libpng libpng-devel freetype freetype-deve L LIBXML2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses

ref:http://blog.csdn.net/priestmoon/article/details/7677452Group_concat:group_concat(distinct name) group_concat(name separator ‘;‘)  // 默认是,group_concat(name order by name desc)SELECT * from Shelvesopbusinessrel;SELECT

requirements, I want to retrieve the results of a =1 or b=1 and c = 0 or c=1Example:SELECT * FROM Test where a = 1 or b = 1 and (c = 0 or c = 1)This retrieves the result set of A=1 or b=1, and then filters out the results of c=0 or c=1.If we change

Pessimistic lock Introduction (encyclopedia):Pessimistic locking, as its name implies, is a conservative attitude to the data being modified by the outside world (including other transactions currently in the system, as well as transactions from

Primary server 192.168.7.182 Centos6.5 MYSQL5.6.10From server 192.168.112.7 Centos6.5 MYSQL5.6.10 Primary server configuration (192.168.7.182) Vi/etc/my.cnf [Mysqld]Server-id=1Log-bin=mysql-binBinlog-do-db=hello the name

Pessimistic locking is not suitable for any scenario, it also has some shortcomings in its existence, because pessimistic locks rely on the database lock mechanism in most cases to ensure the maximum degree of exclusivity of the operation. If the

Copyright QQ87006009 AllFirst, MyISAM engine:1. The Separation service sector:Because the isolation transaction level of the MyISAM is serial. Table-level locks are used, and things and full-text indexes are not supported. It is therefore not

Experience several MySQL cluster Solutions1. Background The cluster solution of MySQL has many official and third-party options, which is a headache. Therefore, we consider that the MySQL database can meet the following three requirements and

PowerDesigner modifies the Table or DataBase ENGINE (storage ENGINE) Type of the MySQL DataBase. 1. Modify the ENGINE (storage ENGINE) Type of a single table (1) select one of the created PowerDesigner tables. The premise is that this table has

Mysql reorganizes notes -- woods memo1. database 1. create database [if not exists] db_name [character set xxx] [collate xxx] * create a database named mydb1. Create database mydb1; * create a mydb2 database using the utf8 character set. Create