MySQL

Install the Compilation tool----This installs BASIC programming tools such as Gcc/g++/gdb/make:sudo apt-get install build-essential Enter the command "sudo apt-get install MySQL", and then double-click the 2 tab key to view information about MySQL

One, my.cnf configuration file[Mysqld]####### #basic settings#########user = MySQL#bind_address =#autocommit = 0Socket =/tmp/Mysqld.sockcharacter_set_server=Utf8mb4skip_name_resolve= 1max_connections= 1000max_connect_errors= 300transaction_isolation=

The previous article is a relatively simple view, in fact, it is relatively simple to use, and later what more about the use of views, the time to add in their own. Next, let's look at the use of triggers!I. Overview OF triggers 　 1.1. What is a

Forwarding Original address: http://www.cnblogs.com/hanzhao1987/p/6100096.htmlMySQL Benefits:Easy to use, low cost, easy to expand, replication leadingThe life cycle of MySQL:MySQL server listener 3306 port > Authenticate Access user > create MySQL

First, user management:1. New User: >create USER name identified by ' Ssapdrow '; 2. Change Password: >set PASSWORD for Name=password (' FDDDFD '); 3. Rights Management >show GRANTS for name; View name User Rights >

LEAST (N1,n2,n3,n4,......)The LEAST () function is the inverse function of greatest (). The purpose is to return the item minimum value from the list of values (N1,N2,N3, and so on). The following example shows the correct use and output of the

MySQL implementation sequence effectThe general sequence (Sequence) is used to process primary key fields, and there is no sequence in MySQL, but MySQL provides self-growth (increment) for similar purposes, but only self-increment, and cannot set

PrefaceIn MySQL, the thread-exclusive memory is mainly used for each client connection thread to store exclusive data for various operations, such as thread stack information, packet sorting operations, data read/write buffering, result set staging,

1. InnoDB Engine IndexInnoDB supports indexes in the following ways:(1) Hash index(2) Full-text indexing(1) B + Tree index can be divided into clustered index and secondary indexThe creation of the index can be done in the CREATE TABLE statement, or

The IP conversion decimal number function is provided in both MySQL and PHP1. IP is converted to digital format by dot format, the code is as follows: mysql> select inet_aton ( ' 127.0.0.1 ' +------------------------+  | Inet_aton (

mysql> Alter table History_text Drop primary key, add index (ID), DROP index history_text_2, add index history_text_2 ( Itemid, id);mysql> Alter table History_log Drop primary key, add index (ID), DROP index history_log_2, add index history_log_2

First KindFirst, modify the My.ini configuration file (MySQL configuration file)Character_set_server = UTF8 #设置字符集Restart MySQL database serviceView the current database character setShow VARIABLES like ' character% ';Second, modify the database

The database used by the company is the MySQL database, and my knowledge of MySQL is just a little bit of learning about PHP at school.I think that as a back-end programmer, in addition to the ability to be able to realize the function,After the

1, query the first line of records:SELECT * FROM table Limit 12, query the nth line to the M recordSELECT * FROM table1 limit n-1,m-n;SELECT * FROM table LIMIT 5, 10; Returns records from Row 6th to line 15thSELECT * FROM Employee limit 3, 1; Return

What is an indexIndexes are used to quickly look for records with specific values, and all MySQL indexes are saved as B-trees. If there is no index, MySQL must start scanning all records of the entire table from the first record until it finds a

There are many ways to install MySQL, but I like Yum best because it's simple and no brains.So first #rpm-UVH http://repo.mysql.com/mysql-community-release-el6-5.noarch.rpm, then #yum install Mysql-community-server, for installation, the version of

Objective: This is a note from the collation of Evernote generated by the small blog, the implementation of the main function is to use the breadth first algorithm crawl small story nets, crawling 100 links and write to MySQL, although CS as a

MySQL alter command, mysqlalter Use the alter command in mysql to edit the table structure. The details are as follows: Modify Field Type mysql> alter table employee change depno depno int(5) not null; Add Index Mysql> alter table name add index

8 MySQL Database Design Optimization Methods for computer second-level examination MySQL The following describes eight Optimization Methods for MySQL Database Design: 1. select the most suitable field attribute MySQL can support access to large data

For a detailed tutorial on installing Mysql5.7.19 on Centos7 in Linux, centos7mysql5.7.19 1. Download mysql Web: https://dev.mysql.com/downloads/mysql/ 2. Select the source code package and click to download the general version. You can download