MySQL

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Sometimes we install or develop Php+mysql+apache applications that require a version of the environment, and we can use the following code to query PHP, MYSQL, and Apache versions of the information to see if they meet our needs.1. Direct access to

Today to ask the net to add a list of functions, the main thing is to list the most read and commented articles in this blog, but there is a problem, the reading volume stored field type is varchar, use DESC or ASC sort, not according to the size of

MySQL master-slave replication is widely used in database backup, failover, data analysis and other occasions.MySQL master-slave replication keeps track of all changes to the database (update, delete, and so on) in the binary log based on the master

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Using the Date_format method SELECT * from ' Ler_items ' WHERE date_format (posttime, '%y-%m ') = ' 2013-03 ' Note: The date must be used ', otherwise no effect Some other about MySQL date lookup statements Mysql> Select Date_format (Date_sub

Example 1, a simple stored procedure cursor instance The code is as follows Copy Code DELIMITER $$DROP PROCEDURE IF EXISTS getuserinfo $$ CREATE PROCEDURE GetUserInfo (in Date_day datetime)----Example--Stored procedure

Int Integer data (all numbers) from -2^31 (-2,147,483,648) to 2^31–1 (2,147,483,647). The storage size is 4 bytes. The SQL-92 synonym for int is integer varchar Length is 0-255 characters OH What is the meaning of the numbers following the int

Aborted_clients Indicates the number of failed connections due to some reason that the client did not close the connection properly. This can happen if the customer does not adjust the mysql_close () function before exiting, or if the

The simplest method of fuzzy query In MySQL we can compare using the like or not like operators. Schema defaults are case-insensitive in MySQL. Query example, Student table +--------+---------+-------+-----------------+---------+| Studid | name |

Linux Software Installation has a lot of, in order to ensure the stability of the server operation, many people will be compiled software to install the source code to install the software; I'll put up the compile process on the VPS, including the

LAMP is the abbreviation of Linux Apache MySQL PHP, in fact, the Apache, MySQL and PHP installed on the Linux system, to form an environment to run PHP scripting language. As for what is the PHP scripting language, I no longer introduce, please

Mysql "on duplicate key update" syntaxIf the on duplicate key update is specified at the end of the INSERT statement and the DUPLICATE value appears in a UNIQUE index or primary key after the row is inserted, UPDATE is executed ON the row with the

Old Jiang installed the MySQL database by default when installing the website environment on the Linux MB small memory VPS server the day before yesterday. It was found that the installation was not possible because the memory was insufficient

The MySQL architecture is master-slave (master-slave), and the master node is automatically switched to slave when the master node fails. You can also set it to a dual master, but there is a drawback: when the pressure on the master is very high,