MySQL

Several common use cases: 1. Exporting the entire databaseMysqldump-u user name-p database name > exported file nameMysqldump-u wcnc-p SMGP_APPS_WCNC > Wcnc.sql2. Export a tableMysqldump-u user name-P database name Table name > exported file

Seniors always say, to learn while recording, to summarize. So, start to record 1.1 points of what you've learned every day.Complex theory does not understand, will only be installed, well after the start to play!1. Download the corresponding RPM

#!/bin/bash#Author [email protected]Cd/sqlbak/usr/local/mysql/bin/mysqladmin-uroot-p123456 Flush-logsmaximum_backup_files=10Backup_foldername= "Database_backup"Db_hostname= "localhost"Db_username= "Root"Db_password= "123456"Databases= ("Database

Defined (' ACC ') | | Exit (' Access Denied ');Encapsulates the MySQL operation class, including the connection function, and the query function.Class MySQL extends absdb{protected static $ins = NULL;protected $host; Host Nameprotected $user; User

Calculated fieldsThe tables stored in the database are stored in columns, but sometimes the information the client wants to get is a combination of several columns, or a sum value. This combination or sum action can be done in the client application,

1.Key_buffer index block size set global Hot_cache. key_buffer_size =1024x768; //set Size show variables like'key_buffer_size'; View size PS::cannot delete the default Key_buffer size cacheIndexEMP in Hot_cache; //Assigning an Hot_cache index block

1. Hash partition PS:: Personally think that the hash partition is very good and powerful, simple and accurate distribution extremely evenly created instances:CREATE TABLEhash_emp (Tidint, TnameChar(255)) PARTITION byHASH (TID) partitions8; The TID

Encountered a MySQL database display garbled problem. Question: (1) in the DOS interface Select a table of values, Chinese all garbled. (2) An error occurred inserting Chinese in the INSERT statement under DOS. Similar incorrect string value: ' \XD6\

background:One of their own site, because the single-table data record up to 1 million, resulting in slow data access, the background of Google Analytics often report timeouts, especially pages with large page is slow.test Environment:First let's

Original: MySQL Backup and restoreMySQL backup and restore is done using the mysqldump, MySQL, and source commands.backup and restore of MySQL under 1.win321.1 BackupStart Menu | Run | cmd | Go to Bin folder with "Cd/program files/mysql/mysql Server

SelectPrimary_count asPrimarycount, Primary_score asPrimaryscore, Junior_count asJuniorcount, Junior_score asJuniorscore, Senior_count asSeniorcount, Senoir_score asSenoirscore, Total_score asTotalscore, Pass_score asPassscore fromPd_paper

You can use this syntax to determine whether a record is present when you insert it, insert it if it does not exist, or update it so that it is convenient to perform no two SQLThis statement is knowledge of MySQL, which is not in the standard SQL

Delete from ZQZRDPwhere Tel in (select min (dpxx_id) from ZQZRDP GROUP BY Tel has count (tel) >1);Execute, ErrorThe exception is: You cannot specify the update of the target table in the FROM clause. Silly, MySQL so write, not, let people

Open MySQL remote connection under LinuxBased on security considerations The root account is generally only accessible locally, but it may be necessary to open the root remote access permission during the development process. Here are the basic

Common functions:Concat connection function Lower to lowercase upper to uppercase length SUBSTR substring now current time year current years ...Process functions:Ifnull (COLUMN,RESULT1,RESULT2) decision word blank return result2, not empty

Multiple table connections:Cross joins (Cartesian product) crosses join (basically meaningless, avoid).Internal connection, that is, the equivalent connection inner join...on ...Left outer connection Join...on ... The records for the primary table

1.mysql normal installation, direct next step.2.php after installation, need to open in My.iniExtension_dir = "ext"Extension=php_mysql.dllExtension=php_mysqli.dllTo support MySQL3. Add in the httpd configuration file###################### PHP

Using MySQL also for a long time, in the process of using a variety of problems encountered, some seemingly very small problems, in the process of the solution took a long time, resolved only to find that the original so simple. So summed up some

Just downloaded MySQL 5.0 from the Web, the search graphics tutorial was installed successfully.1. How to start MySQL at the command lineStart menu, run->cmd;Startup: net start MySQLClose: net stop MySQL2. Go to MySQLmysql-h hostname-u user name-P,

Centos6.5 + Django + mysql + nginx + uwsgi, djangong.pdf 1. Install nginx. Here the nginx-1.6.0 is used, a shell script is created and then executed. #!/bin/bashnginx_version="nginx-1.6.0"yum -y install gcc gcc-c++ pcre pcre-devel openssl