MySQL

EXPLAIN I. Purpose: 1. When must I add an index to the table to obtain a faster select statement that can be remembered using the index? 2. Check whether the optimizer joins the table in an optimal order. The official documentation on explain in

There are multiple causes of garbled characters, one of which is because MySQL uses the ISO-8859-1 (Latin1) Character Set by default, while JAVA uses Unicode encoding internally, so when inserting data into the MYSQL database in JAVA, or when

First, mount the resource: http://download.softagency.net/mysql/downloads /. Find MYSQL5.6. For the two versions, check the system and set them to 64-bit: http://download.softagency.net/mysql/downloads/mysql-5.6/mysql-5.6.16-winx64.zip. Decompress

Mysql binlog3 formats: row, mixed, and statement. Parsing Mysqlbinlog -- base64-output = DECODE-ROWS-v mysql-bin.000144 | more -- Base64-output = DECODE-ROWS: displays the SQL changes brought about by row mode. -V: displays SQL statements in

Method 1: Use the mysql command to viewIn MySQL, you can view common system information directly by checking the status, as shown in the following example:Copy codeThe Code is as follows:1. $ mysql-u root-p2. mysql> s"Threads: 2 Questions: 224857636

Temporary table IntroductionTemporary table featuresRelated ParametersMysql> show global variables like '% table_size '; + rows + ---------- + | Variable_name | Value | + rows + ---------- + | max_heap_table_size | 16777216 | tmp_table_size | 1677721

10. Create a calculated Field The calculated field does not actually exist in the database table. The calculated field is created in your SELECT statement during running. Field (filed): similar to columns, it is often used interchangeably. However,

SQL language basics I. Overview SQL statement comments 1) All contents starting with "#" until the end of the line are comments 2) All content starting with "--" (-- and then a space) until the end of the line is annotated. 3) All content ending

How can I implement a MySQL string that separates the content of a field and writes it to other fields? Use SUBSTRING_INDEX and CONCAT to implement this function. SUBSTRING_INDEX and CONCAT can be used to split and splice MYSQL strings. The

IFNULL (expr1, expr2)If expr1 is not NULL, IFNULL () returns expr1; otherwise, it returns expr2. IFNULL () returns a number or string value, depending on the context in which it is used. SELECT IFNULL(1,0); // 1 SELECT IFNULL(0,10); // 0

Install mysql database. Open the mysqlinstallation file mysql-5.0.zip, decompress it, and run “setup.exe. The following interface is displayed: Start the mysql Installation Wizard and press "Next" to continue Select the installation type, which has

Dear Chinese signature supporter who saves MySQL,The EU may not be able to save MySQL, and China and Russia may be the hope of saving MySQL. China has a strong, independent, and confident Anti-Monopoly Authority. Therefore, I am here to ask for your

NPMserv is a green software for building nginx 0.7.61, PHP 5.3.0, MySQL 5.1.35, phpMyAdmin 3.2.1 and website server platform on a GUI. No installation required, flexible mobility, the root directory under the disk (such as D:/npmserv1_open

Using MYSQL for database backup is also a regular database backup method. It has the same concept as other database servers, but have you ever thought about it, mySQL will have a simpler backup method using the file directory, and it will be faster

Developers always use configuration files to store data that determines application behavior and operations. For example, the php. ini file determines a large number of PHP behaviors. For Smarty, template designers can also take advantage of the

Latest topics Introduction: PHP and MySQL programming (version 3rd) PHP and MySQL database open source technologies have become the best combination for developing Web applications. Web 2.0 provides a broader world for them. This book is

Smarty is a powerful solution that developers often encounter. Even if you haven't chosen it as a template engine, you still want to understand the concept described in this chapter at least: Template-based solutions are necessary. The next chapter

PHPChina news: as MySQL 6.0 is still in its early stages, the content here will change. The following functions have been or are to be added to MySQL 6.0:* The New Falcon transaction storage engine (see "Falcon storage engine" in "13.8 ").* Supports

Create a database table maintenance Specification It is a good idea to perform a database table check on a regular basis rather than when a problem occurs. Taking into account the establishment of a schedule for preventive maintenance to assist with

According to foreign media reports, recently, Google's senior System Engineers showed that most of Google's databases have been migrated from MySQL to MariaDB, this was another time that MySQL was abandoned by heavyweight users after it was acquired