MySQL

MySQL IsNull usage explanation MySQL can use the ISNULL () function. But it works a little differently from Microsoft's ISNULL () function. Let's look at a few is null SQL usage first: SELECT * from newtable where name is null//Get all data with

The following is the use of custom variables in MySQL, writing a union example of a detailed introduction, the need for a friend to come over the reference (Reference self >)Suppose there is such a requirement: Write a union query whose first

In the article "Creating databases and database tables with MySQL," How do we create a database and database table and know how to add records to a database table? So how do we retrieve data from a database table? 1, from the database table to

First recruit, the start and stop of MySQL service net stop MySQL net start MySQL Second recruit, login MySQL The syntax is as follows: Mysql-u user name-p user Password Type the command mysql-uroot-p, enter the password to prompt you, enter 123

1. Single-boot multiple MySQL benefits Make full use of the computing power of single machine Can effectively allocate different logic to different MySQL improve database parallel processing capability Single machine can also easily achieve

Today depressed died, in the Linux down a program old said can't find the table, but I was clearly built the table, in the MySQL command line can also be found, why the program could not find the table? Later consulted a teacher only to fix, the

In the mysqld section of my.cnf, add bind-address=127.0.0.1. You can make MySQL listen to only a specific address. Q: How can I specify that MySQL only listens to a specific address? A: A more common approach is to add bind-address=127.0.0.1 to

When you first install and run MySQL, you may encounter some errors so that the MySQL server does not start. The purpose of this section is to help you diagnose and correct these errors. Your first information when troubleshooting server problems

This article mainly describes the way in which MySQL responds to a disk full error (such as "No remaining space on the device"), and how to respond to a quota error (such as write failure or "Reach User screen limit"). The content described in this

One, data table To ensure data integrity and consistency, you specify field names, field types, and field properties when you create a table, using constraints (constraint), indexes (index), primary keys (primary key), and foreign keys (Foregin key)

This article mainly from the basic situation, cost, advantages and disadvantages and applications, and other aspects of the 5 MySQL reliability scheme for a detailed analysis and comparison, in addition, the MySQL database for the development and

  installed MySQL's default character set is Latin1, in order to change its character set to the user needs (such as UTF8), you must change its relevant configuration file; Because Linux under the MySQL default installation directory is distributed

Today, developers continue to develop and deploy applications that use the lamp (Linux?, Apache, MySQL, and Php/perl) architectures. However, server administrators often have little control over the application itself, because the application is

1,RUN-->CMD->CD C:Program filesmysqlmysql Server 5.5bin 2, Mysql-uxxxx-pxxxxxx 3, show full PROCESSLISTG 4, set Sheduler SET GLOBAL event_scheduler = on; SET @ @global. Event_scheduler = on; SET GLOBAL event_scheduler = 1; SET @ @global.

Indicates that the remote server is remotely reachable. I encountered the problem is this: there are three servers a,b,c, C for the server, B can be successfully connected to PHP with the C machine MySQL, and a machine can not connect! It can be

1. Overview There are two ways to import a MySQL database: 1 lead out the database SQL script, and then import; 2 directly copy the database directory and files. In the case of different operating systems or versions of MySQL, the method of

We know that MySQL does not support conditional indexing. What is a conditional index? A conditional index is an index that is produced after a certain filter on an indexed column based on the Where condition. Such indexes have the following

Common MySQL Operation maintenance commands 1. Change Password: Mysqladmin-u root-p Password The new password Then enter the old password. 2. Export the entire database: Mysqldump-u user name-p database name > exported file name 3. Import

Recently, you need to export the database under Mysql5.0 and then import it into the MySQL 3.23 database. I use the following methods: $ mysqldump-u root--skip-comments--compatible=mysql323--databases db1 DB2 db3 > Mydump.sql Import on another

　　The speed of the insert query: The time to insert a record consists of the following: Connection: (3) Send query to server: (2) Analysis of the query: (2) Insert Record: (1 x record size) Insert Index: (1 x index) Off: (1) The numbers here