MySQL

Whether in a small free database space or a large e-commerce website, it is necessary to reasonably design the table structure and make full use of the space. This requires us to fully understand the Common Data Types of database systems. Next I

Four key steps for JDBC connection to the MySQL database 1. Find the driver MySQL currently provides the Java driver for Connection/J, can be downloaded from the MySQL official website, and find the mysql-connector-java-3.0.15-ga-bin.jar file,

REPLACE runs like INSERT. Except for one, if an old record in the table has the same value as a new record used for the primary key or a UNIQUE index, the old record is deleted before the new record is inserted.MySQL Replace INTO descriptionREPLACE

　Download phpMyAdmin 3.3.6The address is published. If you are interested in phpMyAdmin, you can go to phpMyAdmin to obtain the latest official address.Download phpMyAdmin 3.3.6Download and try it out. PhpMyAdmin 3.3.6 released this time is a

1. MySQLIt is a relational database management system developed by MySQL AB in Sweden. because of its small size, high speed, and low overall cost, in particular, the open source code features that many small and medium websites have chosen the

XAMMPP Version: xampp-win32-1.8.3-0-VC11-installer   MySQL Version: [View the current MySQL version] Use-V Parameters First, we must think of the parameter command to view the version number. The parameter is-V (uppercase letter) or -- version.

If you carefully check the MYSQL permission table, you will find that there are records with the Host Name localhost and the host name 127.0.0.1. When will these two records be used? When you use/usr/local/mysql/bin/mysql-u root-p to access the

This article will introduce the differences between mysql 5.5 and 5.6 timestamp fields DEFAULT CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP. I hope this tutorial will be helpful to you. Mysql5.6 database: The Code is as follows: Copy

You can use many methods to import/export ultra-large SQL text files in mysql, such as direct command operations on the client, multipart import, and source command operations on the client. In practice, sometimes mysql Database Import and import

MySQL database-error 1166 Incorrect column name indicates the field name, which contains spaces. You only need to use alert or phpmyadmin to modify the field. The following error is reported when Navicat for MySQL is used to modify the table fields

In the past, what I introduced most was to export the data in the database, so that the data and structure in the table can be exported directly. Today, only the data structure needs to be exported without the table, let's take a look at the

Mysqld Program-directory and fileBasedir = path uses the given directory as the root directory (installation directory ).Character-sets-dir = path indicates the directory where the character set is stored.Datadir = path reads database files from a

There are two methods to implement fuzzy query in mysql: LIKE/not like, And REGEXP/not regexp. Next I will introduce their usage, I hope this tutorial will help you. First, use LIKE/not like,Second, use REGEXP/not regexp (or RLIKE/not rlike, which

In the temporary mysql table, xxx is full. You only need to modify the tmp_table_size and max_heap_table_size parameters in my. ini. Tmp_table_size if the temporary table in the memory exceeds this value, MySQL automatically converts it to the

We will use join subqueries to update multiple tables using one MySQL statement. Let's take a look at the implementation method. MySQL itself supports updating multiple tables with one update statement. Sometimes this is a very useful

In php and mysql database queries, I have summarized four methods: mysql_result (): mysql_fetch_row (): mysql_fetch_array (): mysql_fetch_object (): four methods, next, let's test and see the best performance. 1. The Code is as follows:

This article does not introduce the simple import and export operations on database data using mysqldump. Here we will introduce how to perform Incremental Backup Data and restore Data Based on mysql binlog logs. Mysql Incremental Backup A small

Next, let's take a look at the mysql database show processlist result analysis. I hope this article will help you. Mysql> show processlist; + -- + ----- + ------- + | Id | User | Host | db | Command | Time | State | Info + -- + ----- + ------- + | 20

Mysql applications often use commands such as data backup, permission management, mysql stop and start, and some common database operation commands. I will sort them out below. Remote Access Mysql-h localhost-uroot-p Change Password Mysqladmin-uroot-

As the programmer may not write the best things, we only need to enable the mysql slow query log function to analyze the performance of each SQL statement. Let's take a look at it. In MySQL, the definition time of a slow query is specified by the