MySQL

1. Access to the INFORMATION_SCHEMA database (information on other databases)Use INFORMATION_SCHEMA;2, query the size of all data:SELECT concat (Round (sum (data_length/1024/1024), 2), ' MB ') as DATA from TABLES;3. View the size of the specified

We can use Speedamp to build a server environment that can be downloaded in http://download.csdn.net/detail/baidu_nod/7630265No installation can be used directly after decompression, click SpeedAMP.exe, then you can access the local database via

1. Registered US-Orange interconnection account: http://www.cndns.com/2, select the Orange cloud Host:3. Select the type of host you need.3, can be at any time to communicate with customer service. Login to Admin center after purchase4, click on the

Group understanding grouping can be seen in the following example, first we print out the Products table as followsAs can be seen from the table above, each vendor has a number of products, then how to count how many products per vendor at a time?

Practice One:There is a score table Stu as follows: Name Subjects Results Tom Mathematical 90 Tom Chinese 50 Tom Geographical 40 John

We installed the MySQL server, set up the root user password of MySQL, and then directly began to use, in fact, such a MySQL server there are still some unsafe factors, this article demonstrates with the command mysql_secure_ Installation to safely

1. Error description2014-7-12 21:06:05 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getpoolmanager info: Initializing c3p0 pool ... Com.mchange.v2.c3p0.ComboPooledDataSource [Acquireincrement, 3, acquireretryattempts, Acquireretrydelay ,

MySQL command line export database:1. Go to the Bin folder in the MySQL directory: cd MySQL to the Bin folder directoryAs I entered the command line: CD C:\Program files\mysql\mysql Server 4.1\bin(or add the directory to the Windows environment

win7+vs2010 Source compiled MySQL recently due to the internship, the focus is on some database development, in order to better understand the implementation of the database mechanism, the current initiation of the MySQL database to study the

MysqlMulti-instance1.my.cnfBy defining Mysqldconfig class Mysqld_vars = {} Get a lot of configuration file related parameter write dictionary from insidemysql.py2.init DBInitializing the database3. Modify Permissions4.rc Script Startup5.check Check

1. Finding Duplicate rowsSELECT * from WHERE in (SELECTfromGROUPby hasCOUNT (*>1)2. Delete duplicate rows (keep one)PS: Because of the delete of MySQL, if the in condition of the deleted table has in, and in inside also has this table, then

The following article is mainly about the MySQL service can not start the case, the actual solution cannot be completely uninstalled description, the following is to solve the MySQL service can not start the case of the specific scenario description,

MySQL has just installed the only known host is: localhost and 127.0.0.1, if you want to let your on-machine IP can be logged in a normal way there are two ways:One is to authorize your IP 172.16.1.10.Grant privileges on dbname.* to "user" @ "172.16.

Before the Server Configuration Test service environment, I lazy handy with the online ready-made script to install, the results of MySQL can not start, so I only honestly reinstall MySQL Server, originally thought Apt-get--purge this kind of

This article introduces the basics of MySQL full-text indexing in the following ways: Several considerations for MySQL full-text indexing Syntax for full-text indexing Introduction to several types of searches Examples of

Command: Show Processlist;If it is the root account, you can see the current connection for all users. If you are a normal account, you can only see the connection you are occupying.Show Processlist; only the first 100 are listed, please use show

Try MySQL under Ubuntu, want to set the default character set again, the result finally MySQL broken, each execution: "Mysql-u root-p" time, will be error: "Error 2002 (HY000): Can ' t connect to Local MySQL server through socket

In order to prevent unscrupulous site crawler crawling articles, hereby identified, reproduced please indicate the source of the article. LAPLACEDEMON/SJQ.Http://www.cnblogs.com/shijiaqi1066/p/3830007.html1 mysqldump Command BackupThe mysqldump

1. Database linkint cppdatebase::D atabaseconnect (sBit8 *uname,sbit8 *pword,sbit8 *dbname){Dbhandle = Mysql_init (NULL);if (NULL = = Dbhandle){coutReturn (-1);}if (NULL = = Mysql_real_connect (dbhandle, "localhost",

Mysql partition management 1. mysql partition processing partition field NULL Value Method 1. range partition null is treated as the minimum value. 2. the null Value of list partition must be enumerated; otherwise, error 3 occurs. the null Value of