MySQL

Advanced queries in MySQLPreviously learned query syntax: Select field name from table name where conditionIn fact, the syntax of the query varies a lot:1. Select can query an expression, which is an operator + operand.For example 1 + 1 2 * 3 2-1+5*9

On the Internet to find a great God's treatmentRight-click cmd after installing MySQL with administrator rights1. Administrator login system, stop the MySQL service or end the MYSQLD-NT process;2. Go to the command line and come to the MySQL

Previously learned query syntax: Select field name from table name where conditionIn fact, the syntax of the query varies a lot:1. Select can query an expression, which is an operator + operand.For example 1 + 1 2 * 3 2-1+5*9 math.random () * 1;As

Why optimize the storage of IP addresses?Many times, when we operate MySQL, and to be overly concerned about how to optimize the content of MySQL storage, improve access speed, but do any program design on the basis of functional implementation to

The 5.7 version of MySQL has a slightly different installation than the previous version, which recordsClick here to download to MySQL and unzip it to a folderand modify the My-default.ini file, as follows:Then create an empty data folder under the

Demand1) A project can be handled by multiple employees2) A worker can take charge of multiple projects3) Employee's salary shall be determined by job---------------------------------------------------------------------------Working hour table for

IntroductionSometimes we need to copy the table structure of a table intact to generate a new table, and MySQL provides two convenient methods.Cases: create table Tb_base (id int not null primary key ,name varchar (10 key Ix_name

Yum install-y gcc gcc-c++ gcc-g77 autoconf automake zlib* fiex* libxml* ncurses-devel libmcrypt* libtool-ltdl-devel*/ /install the compilation environment GCCRZ uploads cmake-2.8.8.tar.gz and mysql-5.5.32.tar.gzTar XF cmake-2.8.8.tar.gz//Unzip

1. Download and decompress MySQL database wget Http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.11-linux-glibc2.5-x86_64.tar.gzs Tar- XVF mysql-5.7.11-linux-glibc2.5-x86_64.tar.gz-c/usr/local/mysql-5.7.11 2. Create a soft link ln-s mysql-5.7.11

5.1 What is a stored procedureSQL statements with logicThe previous SQL has no condition to judge, no loopsStored procedures with Process Control statements (if while)5.2 Characteristics of stored procedures1) execution efficiency very fast! Stored

/*Because of the current MySQL tools and convenient, such as SQLyog, so in fact, build a database table (or even additions and deletions) only need to operate in such tools, it can also minimize errors.The following statements will be used only when

mysql_connect () connection to the database, the connection successfully returns the identifier, and the failure returns falsemysql_select_db () Select database, select confiscate returns True, Failure returns falsemysql_query () executes an SQL

There are two ways to use limit for paging in MySQLExample 1, suppose that there are 13 data in the database table student.code example:Statement 1:select * FROM student limit 9,4Statement 2:slect * FROM student limit 4 offset 9Statements 1 and 2

1. What is a view?A view is a virtual table formed by the results of a query.2. When should I use the view?If a query result occurs very frequently, that is, you should always take this query result to make subqueries3. Creation syntax for

The scenario is as follows:There is a balance in the user account and the balance needs to be updated in real time when a transaction occurs. If there is a concurrency problem, then the user balance and the actual transaction will be inconsistent,

NET commands have been learned in the computer network course and can be used to start a background service. In MySQL, net commands are used to start the background server process mysqld, which is the background service.However, if the net start

Reference 1190000003063874If we use the traditional mysqldump to implement MySQL master-slave, we need to lock the library, if the online environment will affect the operation, so we use Xtrabackup to implement MySQL master-slave

Statements under the A.window1.mysqld-install//install MySQL service2.mysqld-remove//Uninstall MySQL Service3.net start MySQL//start service4.net stop MySQL//stopping service5.mysql-u root-p//Login6.mysqladimn-u root-p PASSWORD 123456//Set a

Using a subquery example:SELECT * from your_table WHERE ID (SELECT ID from your_table ORDER by id desc LIMIT ($page-1) * $pagesize )ORDER by id desc LIMIT $pagesizeUsing the connection example:SELECT * from your_table as T1JOIN (SELECT ID from

SQL --- Chapter01 database and SQL, SQL --- chapter01sqlDatabase Type: Hierarchical Database (HDB) Data is displayed in a hierarchical structure (tree structure. Relational Database (RDB) Use a special Structured Query Language (Structured