Home Database Mysql Tutorial MySQL模糊查询语法

MySQL模糊查询语法

Jun 07, 2016 pm 03:19 PM
linux mysql Inquire Vague Community grammar Enter

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 MySQL提供标准的SQL模式匹配,以及一种基于象Unix实用程序如vi、grep和sed的扩展正则表达式 模式匹配的格式。 SQL的模式匹配允许你使用"_"匹配任何单个字符,而"%"匹配任意数目字符(包括零个字符)

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入

  MySQL提供标准的SQL模式匹配,以及一种基于象Unix实用程序如vi、grep和sed的扩展正则表达式

  模式匹配的格式。

  SQL的模式匹配允许你使用"_"匹配任何单个字符,而"%"匹配任意数目字符(包括零个字符)。

  在 MySQL中,SQL的模式缺省是忽略大小写的。下面显示一些例子。注意在你使用SQL模式时,你不

  能使用=或!=;而使用LIKE或NOT LIKE比较操作符。

  为了找出以"b"开头的名字:

  mysql> SELECT * FROM pet WHERE name LIKE "b%";

  +--------+--------+---------+------+------------+------------+

  | name | owner | species | sex | birth | death |

  +--------+--------+---------+------+------------+------------+

  | Buffy | Harold | dog | f | 1989-05-13 | NULL |

  | Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 |

  +--------+--------+---------+------+------------+------------+

  为了找出以"fy"结尾的名字:

  mysql> SELECT * FROM pet WHERE name LIKE "%fy";

  +--------+--------+---------+------+------------+-------+

  | name | owner | species | sex | birth | death |

  +--------+--------+---------+------+------------+-------+

  | Fluffy | Harold | cat | f | 1993-02-04 | NULL |

  | Buffy | Harold | dog | f | 1989-05-13 | NULL |

  +--------+--------+---------+------+------------+-------+

  为了找出包含一个"w"的名字:

  mysql> SELECT * FROM pet WHERE name LIKE "%w%";

  +----------+-------+---------+------+------------+------------+

  | name | owner | species | sex | birth | death |

  +----------+-------+---------+------+------------+------------+

  | Claws | Gwen | cat | m | 1994-03-17 | NULL |

  | Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 |

  | Whistler | Gwen | bird | NULL | 1997-12-09 | NULL |

  +----------+-------+---------+------+------------+------------+

  为了找出包含正好5个字符的名字,使用"_"模式字符:

  mysql> SELECT * FROM pet WHERE name LIKE "_____";

  +-------+--------+---------+------+------------+-------+

  | name | owner | species | sex | birth | death |

  +-------+--------+---------+------+------------+-------+

  | Claws | Gwen | cat | m | 1994-03-17 | NULL |

  | Buffy | Harold | dog | f | 1989-05-13 | NULL |

  +-------+--------+---------+------+------------+-------+

  由MySQL提供的模式匹配的其他类型是使用扩展正则表达式。当你对这类模式进行匹配测试时,使用

  REGEXP和NOT REGEXP操作符(或RLIKE和NOT RLIKE,它们是同义词)。

  扩展正则表达式的一些字符是:

  "."匹配任何单个的字符。

  一个字符类"[…]"匹配在方括号内的任何字符。例如,"[abc]"匹配"a"、"b"或"c".

  为了命名字符的一个范围,使用一个"-"."[a-z]"匹配任何小写字母,而"[0-9]"匹配任

  何数字。

  " * "匹配零个或多个在它前面的东西。例如,"x*"匹配任何数量的"x"字符,"[0-9]*"

  匹配的任何数量的数字,而".*"匹配任何数量的任何东西。

  正则表达式是区分大小写的,但是如果你希望,你能使用一个字符类匹配两种写法。例如,

  "[aA]"匹配小写或大写的"a"而"[a-zA-Z]"匹配两种写法的任何字母。

  如果它出现在被测试值的任何地方,模式就匹配(只要他们匹配整个值,SQL模式匹配)。

  为了定位一个模式以便它必须匹配被测试值的开始或结尾,在模式开始处使用"^"或在模式的

  结尾用"$".

  为了说明扩展正则表达式如何工作,上面所示的LIKE查询在下面使用REGEXP重写:

  为了找出以"b"开头的名字,使用"^"匹配名字的开始并且"[bB]"匹配小写或大写的"b":

  mysql> SELECT * FROM pet WHERE name REGEXP "^[bB]";

  +--------+--------+---------+------+------------+------------+

  | name | owner | species | sex | birth | death |

  +--------+--------+---------+------+------------+------------+

  | Buffy | Harold | dog | f | 1989-05-13 | NULL |

  | Bowser | Diane | dog | m | 1989-08-31 | 1995-07-29 |

  +--------+--------+---------+------+------------+------------+

[1] [2] 

MySQL模糊查询语法

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

MySQL's Role: Databases in Web Applications MySQL's Role: Databases in Web Applications Apr 17, 2025 am 12:23 AM

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 Introduction Example Laravel Introduction Example Apr 18, 2025 pm 12:45 PM

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.

Linux Architecture: Unveiling the 5 Basic Components Linux Architecture: Unveiling the 5 Basic Components Apr 20, 2025 am 12:04 AM

The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

How to run java code in notepad How to run java code in notepad Apr 16, 2025 pm 07:39 PM

Although Notepad cannot run Java code directly, it can be achieved by using other tools: using the command line compiler (javac) to generate a bytecode file (filename.class). Use the Java interpreter (java) to interpret bytecode, execute the code, and output the result.

Solve database connection problem: a practical case of using minii/db library Solve database connection problem: a practical case of using minii/db library Apr 18, 2025 am 07:09 AM

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.

How to check the warehouse address of git How to check the warehouse address of git Apr 17, 2025 pm 01:54 PM

To view the Git repository address, perform the following steps: 1. Open the command line and navigate to the repository directory; 2. Run the "git remote -v" command; 3. View the repository name in the output and its corresponding address.

MySQL vs. Other Programming Languages: A Comparison MySQL vs. Other Programming Languages: A Comparison Apr 19, 2025 am 12:22 AM

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.

Laravel framework installation method Laravel framework installation method Apr 18, 2025 pm 12:54 PM

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.

See all articles