sql 通配符小问题 在线急等
本人mysql菜鸟一枚
遇到通配符的问题求助各位大神
我想选取users表中姓名包含"szo"或者"szö"的数据
所以写了以下代码:
select * from users where name like '%sz[oö]%'
数据库有这样的数据
但是返回值是0
尝试
select * from users where name like '%szo%' or name like '%szö%'
有结果
请问这两个有什么不一样?
回复讨论(解决方案)
mysql like 的通配符只有 "_" 和 "%"
"_"是匹配任意单个字符
"%"是匹配任意多个字符。
select * from users where name like '%sz[oö]%'
的意思就是 name 中包含 sz[oö] 的记录。
而不是 包含 szo 或 szö的记录
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
mysql like 的通配符只有 "_" 和 "%"
"_"是匹配任意单个字符
"%"是匹配任意多个字符。
select * from users where name like '%sz[oö]%'
的意思就是 name 中包含 sz[oö] 的记录。
而不是 包含 szo 或 szö的记录
明白了,有解决办法吗
select * from users where name like '%szo%' or name like '%szö%'
你不是已经用这个办法解决了吗?
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
不会吧?你的regexp是怎么写的?
select * from users where name regexp 'sz[oö]'
SELECT * FROM usersWHERE nameREGEXP '(a-z)*sz(o|ö)(a-z)*'LIMIT 0 , 30
解决了谢谢大家
结帖
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
不会吧?你的regexp是怎么写的?
select * from users where name regexp 'sz[oö]'
因为 like 不识别 [oö],regexp 不识别 %, 所以拉
SELECT * FROM usersWHERE nameREGEXP '(a-z)*sz(o|ö)(a-z)*'LIMIT 0 , 30
select * from users where name like '%szo%' or name like '%szoö%'
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
不会吧?你的regexp是怎么写的?
select * from users where name regexp 'sz[oö]'
尝试了一下你的代码 比我的简洁好用
谢谢 不嫌弃我这只菜鸟耐心解答
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
不会吧?你的regexp是怎么写的?
select * from users where name regexp 'sz[oö]'
因为 like 不识别 [oö],regexp 不识别 %, 所以拉
SELECT * FROM usersWHERE nameREGEXP '(a-z)*sz(o|ö)(a-z)*'LIMIT 0 , 30
既然用了regexp,你还要%有何用? 这就好比是穿着登山鞋去打篮球?
select * from users where name like '%szo%' or name like '%szö%'
你不是已经用这个办法解决了吗?
这个说来话长 , 还有 a ä i ï u ü 好麻烦
like并不是正则表达式匹配。而只是通配符%和_等匹配,因此并不支持[xy]这种字符组。
你可以尝试REGEXP
尝试过,一样的结果
有别的办法吗 ?
不会吧?你的regexp是怎么写的?
select * from users where name regexp 'sz[oö]'
尝试了一下你的代码 比我的简洁好用
谢谢 不嫌弃我这只菜鸟耐心解答
客气了。谁不是从菜鸟过来的。
掌握一定的技巧,往往能让学习效率加倍。

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











In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.
