MySQL

Example: The data table is demotable. The fields include ID, condition1, condition2, condition3, condition4, and condition5. The requirement is to query the content of any two or more conditions in demotable, including condition1, condition2,

Installation environment Centos 1, 5.4 MySQL 5.1.xx is directly installed using rpm Xtrabackup 1.2.22 directly installed with RPM CopyCode The Code is as follows: [mysqld] Server-id = 1 Log-bin Innodb_flush_log_at_trx_commit = 1 Sync_binlog =

1. because the slave configuration information is set, MySQL generates master.info in the database data directory. Therefore, if you want to modify the related slave configuration, delete the file first. Otherwise, the modified configuration cannot

These two days make it difficult to query a data. The main reason is that the understanding of group by is not deep enough. This is the case. I think many people have met this requirement. Below is my content table simulation CopyCode The Code is

After query, I know that the MySQL field is too long, so I just changed the length of the two fields. When an index is created, the length of the key calculated by the database is to accumulate the char length of all the fields used by the index,

1> extract the compressed file mysql-noinstall-5.1.6-alpha-win32.zip to a directory, set mysql_home in the environment variable, and add % mysql_home % \ bin to path. 2> Create my. ini configuration file, content: [mysqld] # Set basedir to MySQL

Drop procedure if exists pro_rep_shadow_rs; Delimiter | ---------------------------------- -- Rep_shadow_rs -- Used to process information addition, update, and deletion -- Only data that has not been updated since the last time is updated each time.

After installing mysql, the preparation file should be in the/usr/local/mysql/share/mysql directory. There are several preparation files, including my-huge. cnf my-medium.cnf my-large.cnf my-small.cnf, different traffic of the site and different

1. Preface: MySQL database is a fully networked cross-platform relational database system and a distributed database management system with a client/server architecture. It has the advantages of strong functions, ease of use, convenient management,

First, when creating a database, be sure to generate the same encoding format of the original database. If the database has been generated, use phpmyadmin and other tools to organize it again to prevent garbled characters caused by inconsistent

1. Cause Analysis of Table CorruptionThe following are common causes of mysql table destruction: 1. Data Files are damaged due to a sudden power failure on the server. 2. Force Shutdown without shutting down the mysql service first. 3. The mysqld

Mysql full-text search: MATCH (col1, col2 ,...) AGAINST (expr [in boolean mode | with query expansion]) For example: SELECT * FROM articles where match (title, body) AGAINST ('database '); The MATCH () function performs a natural language search in

Today, my friend xjb also encountered this problem. So I wrote this note and recorded the description and solution of this problem. Problem description: A web interface can be used to connect to mysql, but the following prompt is displayed on the

When an external program accesses a database (such as PHP), many SQL statements need to be organized. Especially when the business logic is complex, a lot of SQL statements and conditions are mixed in PHP code, which is chilling. With the MySQL

The following error occurs when using javabean, 66480555 [http-80-4] WARN org. hibernate. util. JDBCExceptionReporter-SQL Error: 1366, SQLState: HY00066480555 [http-80-4] ERROR org. hibernate. util. JDBCExceptionReporter-Incorrect string value: '\

1. Use of arrays in PHP It is very helpful to use associatively-indexed arrays when operating the database. Let's take a look at the basic number format of array traversal: Copy codeThe Code is as follows: $ Temp [0] = "richmond "; $ Temp [1] =

Copy codeThe Code is as follows: /* MYSQL database access Encapsulation MYSQL Data access method. php4 supports process access methods starting with mysql _. php5 supports processes starting with mysqli _ and mysqli object-oriented Access method.

For the description of the valid format of the value range of each type and the specified date and time value, see 7.3.6 Date and Time type. Here is an example of using the date function. The following query Selects all records. The value of

Core code: Copy codeThe Code is as follows: alter table name AUTO_INCREMENT = Set Value ALTER [IGNORE] TABLE tbl_name alter_spec [, alter_spec...] in MySQL ALTER syntaxCopy codeThe Code is as follows: alter_specification:ADD [COLUMN]

When a record is inserted in a table in SQL or MySQL databases, a trigger is triggered to insert the same record to another table in the same database. In the course of learning, we find that the two are written differently. 1. Create two SQL