mysql update table syntax

ALTER TABLE Syntax ALTER [IGNORE] TABLE tbl_name alter_spec [, Alter_spec ...] Alter_specification:ADD [COLUMN] create_definition [i | After column_name]or ADD [COLUMN] (create_definition, create_definition,...)or ADD INDEX [index_name] (Index_col_

In order to better optimize MySQL in high concurrency, it is necessary to understand the locking table mechanism when MySQL query is updated.I. OverviewMySQL has three levels of Lock: page level, table level, row level.MyISAM and MemoryStorageThe

MySQL Union table update and deletion syntax introduction, mysql Union table syntax Preface I believe that when you use mysql in daily use, you may need to update two tables at the same time. I will use two SQL statements in the same transaction to

MySQL常用指令，java，php程序员，数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

Related Articles: MySQL "on duplicate key update" Syntax Insert into .. on duplicate key to update multiple rows Http://dev.mysql.com/doc/refman/5.1/zh/sql-syntax.html#insert     MySQL "on duplicate key update" Syntax If the on duplicate key update

MySQL "on DUPLICATE KEY UPDATE" syntaxIf an on DUPLICATE KEY UPDATE is specified at the end of the INSERT statement, and the row is inserted to cause duplicate values in a unique index or primary KEY, UPDATE is performed on the row where the

1. download MySql 1. download MySql Open http://www.mysql.com/downloads/mysql/#downloads download in browser My downloaded version is Red Hat 5 version of http://www.mysql.com/downloads/mirror.php? Id = 407552 Upload the file to the server, or

mysql| Standard | reference | reference Manual | chinese MySQL Chinese reference manual 6 (MySQL compatibility with the standard) Reprinted translator: Yan Zi return 〗〖 Forwarding Q Translator: Yan Zi (clyan@sohu.com) Homepage:

Ext.: http://www.jb51.net/article/39255.htmMySQL "on DUPLICATE KEY UPDATE" syntaxIf an on DUPLICATE KEY UPDATE is specified at the end of the INSERT statement, and the row is inserted to cause duplicate values in a unique index or primary KEY,

Install MySQL1. Download the MySQL Installation FileThe following two files are required to install MYSQL:MySQL-server-5.1.7-0.i386.rpm To download the above two RPM files, locate the "server" and "client programs" items and find the items