MySQL

New features such as views, stored procedures, and triggers are added to MySQL 5. Many of them are described. One of them is called the store function, which is a bit like the stored procedure, but the returned value is Oh, the usage is quite

Today, we need to migrate a database of about 26 MB to my desktop. So I used heidisql on other machines to export the database into a large SQL file, which contains the database structure and data. Probably because the data volume imported at a

Summary of small tips commonly used in six MySQL statements 1) For example, to calculate the current size of a person, assume that the variable of the person's birthdate is @ dateofbirth,ThenSelect date_format (from_days (to_days (now ()-to_days

 The server_id field in the table is of the varchar type. Now we want to sort the data in order of server_id. The sorting result is as follows: Select server_id from cardserver where game_id = 1 order by server_id DESC limit 10;+ ----------- +|

MySQL replace usage1. ReplaceReplace into table (ID, name) values ('1', 'A'), ('2', 'bb ')This statement inserts two records into the table. If the primary key ID is 1 or 2 does not existIt is equivalentInsert into table (ID, name) values ('1', 'A'),

Now there is a table named student. I want to copy the data in this table to a new table named dust. Although the following statements can be used for copying, I always feel uncomfortable, thank you for your help.Answer 01:Create Table Dust select *

Two steps are required to remotely connect to MySQL: The first step is to create a MySQL user that can be remotely connected Mysql> grant all privileges on remote. * to remote @ "%" identified"Remotepwd "; Step 2: Modify the MySQL configuration file/

Description MySQL DATAThe Database supports master-slave database clusters, master-slave database backup, and master-master mutual backup. The following describes the master-master synchronous backup. The so-called master-master synchronization

A few days ago, I encountered a strange problem in the management system. Today I have the opportunity to install the MySQL environment to reproduce this problem. Because it is not the most primitive environment, it may not be completely reproduced,

Http://publish.itpub.net/a2011/0304/1162/000001162908.shtml The lock mechanism enables multiple threads to operate a table at the same time. As shown in, user a, user B, and user C may query or update data table A at the same time or successively

We can see the concurrent_insert parameter today and explain it as follows: The MyISAM storage engine has a system variable concurrent_insert, which is used to control its Concurrent Insertion behavior. The values can be 0, 1, or 2,

At the same time, the online access volume continues to increase. For servers with 1 GB of memory, the server even crashes every day or gets stuck from time to time. This problem has plagued me for using MySQL for more than half a month. scalable

Refer to this article Local Environment: ubuntu12.04, fedora-17 MySQL version: 5.5.28 Cmake version: 2.8.9 1. download the latest cmake version, decompress it, compile and install it. sudo ./configure --prefix=/usr/local/etc/cmake-2.8.9sudo

Select pagenum, count (pagenum) from page group by pagenum having count (pagenum)> 1 limit 0, 50; + --------- + ---------------- +| Pagenum | count (pagenum) |+ --------- + ---------------- +| 60128 | 2 || 60129 | 2 || 60130 | 2 || 60131 | 2 || 6013

InnoDB InnoDB supports transaction processing, which processes many short-term transactions, which are often executed successfully rather than rolled back. InnoDB is MySQL's most popular storage engine. Common Non-transaction engine requirements,

Recently, many problems have been encountered with the use of MySQL. Who asked the old man to have a bunch of DBAs? I didn't care about it. I just used gepi myself. Please advise. 1. Potholes repair For online machines, the configuration should be

Unity3d connection to MySQL database  1. Set up a MySQL database in Mac OS X Download MySQL for Mac http://dev.mysql.com/downloads/mysql/5.0.html You can use the PKG format of the binary installation package to install MySql in Mac OS X 10.2.x

1. Create a user: Command: create user'Username' @ 'host' identified by 'Password '; Description: username-the username you will create, host-specifies the host on which the user can log on. If a local user can use localhost, if you want to allow

Import java. SQL .*; Public class testjdbc { Public static void main (string [] ARGs ){ Resultset rs = NULL; Statement stmt = NULL; Connection conn = NULL; Try { String url = "JDBC: mysql: // 127.0.0.1: 3306/Multi "; String user = "root "; String

C ++ is a very complex language. It is complicated because it is difficult to control the flexibility, but there is no way. If it is on this ship, it will be adapted to its complicated rules for the moment. The details of the language will be