请进,几个小问题
请进,几个问题
1、PHP如何判断mysql是否支持分区
2、按字段范围分区,大家都知道程式为:
- SQL code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->PARTITION BY RANGE (check_id) (PARTITION p0 VALUES LESS THAN (1),PARTITION p1 VALUES LESS THAN (2),PARTITION p2 VALUES LESS THAN MAXVALUE);
但我不想按范围分,因为我的字段是常数,我想按直接相等分(大家明白吧),想实现下面的意思怎么办呢?
- SQL code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->PARTITION BY RANGE (check_id) (PARTITION p0 VALUES=(1),PARTITION p1 VALUES=(2),PARTITION p2 VALUES=MAXVALUE);
另,字段check_id如果为字符串(比如固定值A、B、C)是否也可以
3、对分好区的表,查询时如何指定分区查询。(因为我知道要查的数据就在某分区)
比如我将字段check_id="1"的数据分到part_01,check_id="2"的分到part_02,那么:
SELECT * FROM text WHERE word="abc" AND check_id="1";
是不是可以直接写成:
SELECT * FROM text PARTITION(part_01) WHERE word="abc"; //这里check_id="1"不用了,对么
回答请详细些,同仁们!
------解决方案--------------------
mysql 的數據分區。百度一下。
------解决方案--------------------
百度吧
------解决方案--------------------
1、PHP如何判断mysql是否支持分区
SHOW VARIABLES LIKE '%partition%';
查询结果中没有 have_partition_engine 或 value 列 为 No 时,表示不支持
------解决方案--------------------
mysql 支持 5 种分区方式
RANGE分区
LIST分区
HASH分区
KEY分区
子分区
不太理解你描述的属于哪种方式,自己分析一下吧
------解决方案--------------------
http://dev.mysql.com/doc/refman/5.1/zh/partitioning.html
文档里有分区的介绍。不同分区是不一样的

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

Laravel is a PHP framework for easy building of web applications. It provides a range of powerful features including: Installation: Install the Laravel CLI globally with Composer and create applications in the project directory. Routing: Define the relationship between the URL and the handler in routes/web.php. View: Create a view in resources/views to render the application's interface. Database Integration: Provides out-of-the-box integration with databases such as MySQL and uses migration to create and modify tables. Model and Controller: The model represents the database entity and the controller processes HTTP requests.

The process of starting MySQL in Docker consists of the following steps: Pull the MySQL image to create and start the container, set the root user password, and map the port verification connection Create the database and the user grants all permissions to the database

MySQL and phpMyAdmin are powerful database management tools. 1) MySQL is used to create databases and tables, and to execute DML and SQL queries. 2) phpMyAdmin provides an intuitive interface for database management, table structure management, data operations and user permission management.

I encountered a tricky problem when developing a small application: the need to quickly integrate a lightweight database operation library. After trying multiple libraries, I found that they either have too much functionality or are not very compatible. Eventually, I found minii/db, a simplified version based on Yii2 that solved my problem perfectly.

Article summary: This article provides detailed step-by-step instructions to guide readers on how to easily install the Laravel framework. Laravel is a powerful PHP framework that speeds up the development process of web applications. This tutorial covers the installation process from system requirements to configuring databases and setting up routing. By following these steps, readers can quickly and efficiently lay a solid foundation for their Laravel project.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA
