MySQL

1. Copy the table structure and data to the new table create table new table select * from old table this method will copy all the content in oldtable, of course we can use Delete from newtable; to delete. However, the worst thing about this method

Use this table for testing   Create Table 'test '. 'word' ( 'id' integer unsigned not null auto_increment, 'word' varchar (45) not null, Primary Key ('id'), unique index 'index _ 2' ('word') ) engine = InnoDB;   Check that the word has

1. Set phpMyAdminLanguage: Chinese Simplified (zh-utf-8)MySQL Character Set: UTF-8 Unicode (utf8)MySQL connection verification gbk_chinese_ci 2. When creating a databaseSet it to gbk_chinese_ci. 3. Create a table using SQLEngine = MyISAM default

1] how to create a management user for the mysqld database? After the database is installed, we should create a management account for the mysql database. To set the root user as the administrator, we should run the following command; [Root @

When using MySQL, you must pay attention to security issues. The following are 23 notes for MySQL: 1. If the connection between the client and the server needs to span and pass through an untrusted network, you need to use an SSH tunnel to encrypt

Let's start with a common example: 1. Get the current time and format it. DECLARE I INT;SET I = date_format (now (), '% Y % m % D '); ADDTIME (date2, time_interval) // Add time_interval to date2 CONVERT_TZ (datetime2, fromTZ, toTZ) // convert the

Link: http://imysql.com/node/298 I have previously written about how to obtain MySQL procedure results through PHP. However, this method cannot adapt to multiple result sets. A multi-result set refers to multiple SELECT queries and multiple result

Efficiency Comparison Between select count (*) and select count (COL) (refer to the http://hi.baidu.com/wrjgg/item/f5b823b4e1dca79918469729 ): 1. Select count (*) from tablename is the optimal choice under any circumstances; 2. Minimize select count

MySQLMedium, singleStore procedure (SP)Not an atomic operation,OracleIt is atomic. The following stored procedure, even if the statement2Failed, statement1Will still beCommitTo the database: SQL code 1-1: Create table testproc (id int (4) primary

InOracleMedium,SequenceMultiple tables and multiple fields can share one unique value.MySQLThe auto-incrementing Column exists, which can basically meetPK. However, the auto-increment column has restrictions: A.It can only be used for one field in

Sometimes, you do not want the stored procedure to throw an error and stop the execution. Instead, you want to return an error code. MySQL Supports exception handling by defining Continue/exit Exception Handling Handler To capture Sqlwarning/not

Stored procedures often need to return multiple result sets. Mysql Directly Using Select Returns the result set. While Oracle You need to use a cursor to return the knot. Result Set. This point Mysql The following code outputs two result

Http://wenku.baidu.com/view/3f7319a4f524ccbff1218468.html 1. Install Http://www.cnblogs.com/276815076/archive/2012/04/01/2428364.html Installation Package Sudo apt-get install mysql-server Set root Password Mysqladmin-u root password 'abc123'-p 2

I have been using Oracle databases all the time, so when designing CDM, the primary keys of tables not selected will automatically grow. This is only available in SQL Server and MYSQL. In Oracle, SEQUENCE is generally used to handle the problem of

First, go to www.mysql.com download MYSQL5.0: mysql-standard-5.0.16-linux-i686.tar.gz version is more suitable for us these talented birds!Then, enter the following command in the terminal:[Code] shell> groupadd mysqlShell> useradd-g mysqlShell>

When using MySQL, we often encounter table names that do not comply with the specifications or standards, but there is already a large amount of data in the table. How can we keep the data and only change the table name?You can create a table with

  References:1. Data Table Name: popadv, which contains a field: ADV, which is used to store ad links. There are about 100 records.2. Try to achieve the average value based on the randomly selected advertisements, that is, the chances for these 100

Define ("MYSQL_ SQL _GETDATA", 1 );Define ("MYSQL_ SQL _EXECUTE", 2 ); Class mysql_db { Var $ _ server; // address of the Database serverVar $ _ user; // database connection accountVar $ _ password; // database connection passwordVar $ _ dbname; //

# Include "DBAccess. h"# Include // Using namespace std;DBAccess: DBAccess (){}DBAccess ::~ DBAccess (){ }Bool DBAccess: MysqlConnect (){Mysql_init (& mysql );If (mysql_real_connect (& mysql, "localhost", "root", "123456", "DBTroFish", 3306, NULL, 0

[Compile] Innodb is compiled as a plug-in by default in the form of Dynamic Links (*. so). You can./configure -- help | less to view details. After installation, it will be placed in./lib/mysql/plugin. The parameters will be loaded later: --