type mysql

Mysql summary. The explain statement is mainly used for select queries in SQL statements. it can display the index hits of the SQL statement, so as to better utilize the index and optimize the query efficiency. The Explain syntax is as follows:

The essence of establishing a database is to make it cost-effective while having excellent performance. First, we choose an open Linux operating system. at the same time, there are too many database systems that can be applied in Linux, such as

This article mainly introduces the PDO method used by php, analyzes various PDO operation methods and techniques in detail, and has some reference value, for more information about how to use PDO in php, see this document. Share it with you for your

MySQL index analysis and optimization indexes are used to quickly search for records with specific values. all MySQL indexes are saved as B-trees. If no index exists, MySQL must scan all the records of the entire table from the first record until

Description of the mysql field type. MySQL supports a large number of column types, which can be divided into three types: number type, date and time type, and string (character) type. This section first provides an overview of the available types,

MYSQL log files can be divided into six types. This blog post summarizes seven mysql log maintenance policies and related suggestions based on the learning and experiment of the bloggers. These days I have to deal with mysql servers, so I have

This article mainly introduces the method of modifying the table structure in mysql, and analyzes in detail the methods and precautions for modifying the table structure in mysql in the form of instances, which has some reference value, for more

1. integer MySQL data type meaning (signed) tinyint (m) 1 byte range (-128 ~ 127) smallint (m) 2 bytes range (-32768 ~ 32767) mediumint (m) 3 bytes range (-8388608 ~ 8388607) int (m) 4 bytes range (-2147483648 ~ 2147483647) bigint (m) 8 bytes (+-9.22

Mysql installation diagram The following is an example of MySQL installation. it is installed using an executable file! Open the mysqlinstallation file mysql-5.0.27-win32.zip, decompress the file, and run “setup.exe. the following interface is

Understanding MySQL-index and optimization is at the beginning: indexes have a crucial impact on the query speed. understanding indexes is also the starting point for database performance tuning. Consider the following: assume that a table in the

Mysql primary key auto-Increment 1. define the primary key as the auto-increment Identifier type In mysql, if the table's primary key is set to auto_increment type, the database automatically assigns a value to the primary key. For example:

Mysql defines the primary key as the automatic growth Identifier type. in this article, we will share how mysql defines the primary key as the automatic growth Identifier type. 1. define the primary key as the automatic growth Identifier type in

Configure and use Sphinx In the previous article, I talked about the installation of Sphinx. in this article, I would like to explain how to use it. Taking my blog articles as an example, I want to search the full text of my blog content Table name

This article mainly introduces Mysql log files and log types. This article describes the log file types, error logs, General query logs, slow query logs, binary logs, and so on, for more information, see Log file type MySQL has several different

I wrote the member. php code in the header of the webpage, which often causes traffic exceptions. how can I rewrite the php webpage database? I wrote in the header of the webpage Here is the member. php code FileName =

Mysql database learning (2): data type (numerical date and time string type) Mysql database learning (2): data type (value type date and time type character _ MySQL Data type Value type Date and time type String type I. numeric

MySQLSchema design (4) JQuery in MySQL: common_schema jQuery BitsCN.com We always have to live in a certain framework. the composition of the framework comes from law, morality, and potential rules. Most people only want Ansheng to live. after all,

Having comments is my greatest motivation ~ MySQL basics (storage engine and graphical management tools) and mysql basics. Having comments is my greatest motivation ~ MySQL basics (storage engine and graphical management tools), mysql basics hi was

There are three types of MySQL Stored Procedure parameters (in, out, inout) bitsCN.com I. MySQL Stored Procedure parameters (in)MySQL stored procedure "in" parameter: similar to the value passing of function parameters in C language, MySQL stored

Mysql log file usage and data recovery bitsCN.com Use and data recovery of mysql log files I. mysql log type MYSQL has different types of log files (each storing different types of logs), from which you can query what MYSQL has done and manage