Home Backend Development PHP Tutorial 关于查询的一个有关问题

关于查询的一个有关问题

Jun 13, 2016 pm 01:35 PM
find in quot select set

关于查询的一个问题

某表记录是这样的
id title cid
100 张三 2,3
101 李四 3,4
102 王五 12,13

如果搜索,条件是要查cid字段=2的记录

应该怎么写?

sql语句里的like应该不严谨,可能会把100和102这两条记录都查出来


------解决方案--------------------

SQL code
SELECT * FROM table WHERE FIND_IN_SET('2',cid);
<br><font color="#e78608">------解决方案--------------------</font><br>
mysql> select find_in_set(2, "2,3,4");<br>+-------------------------+<br>| find_in_set(2, "2,3,4") |<br>+-------------------------+<br>|                       1 |<br>+-------------------------+<br>1 row in set (0.00 sec)<br><br>mysql> select find_in_set(2, "52,3,4");<br>+--------------------------+<br>| find_in_set(2, "52,3,4") |<br>+--------------------------+<br>|                        0 |<br>+--------------------------+<br>1 row in set (0.00 sec)<br><br>mysql> select find_in_set(2, "2,3,4");  <br>+-------------------------+<br>| find_in_set(2, "2,3,4") |<br>+-------------------------+<br>|                       1 |<br>+-------------------------+<br>1 row in set (0.00 sec) <div class="clear">
                 
              
              
        
            </div>
Copy after login
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)

Hot Topics

Java Tutorial
1663
14
PHP Tutorial
1263
29
C# Tutorial
1236
24
Detailed explanation of the Set tag function in MyBatis dynamic SQL tags Detailed explanation of the Set tag function in MyBatis dynamic SQL tags Feb 26, 2024 pm 07:48 PM

Interpretation of MyBatis dynamic SQL tags: Detailed explanation of Set tag usage MyBatis is an excellent persistence layer framework. It provides a wealth of dynamic SQL tags and can flexibly construct database operation statements. Among them, the Set tag is used to generate the SET clause in the UPDATE statement, which is very commonly used in update operations. This article will explain in detail the usage of the Set tag in MyBatis and demonstrate its functionality through specific code examples. What is Set tag Set tag is used in MyBati

Tips for using i18n to implement multi-language switching in Vue Tips for using i18n to implement multi-language switching in Vue Jun 25, 2023 am 09:33 AM

With the continuous development of internationalization, more and more websites and applications need to support multi-language switching functions. As a popular front-end framework, Vue provides a plug-in called i18n that can help us achieve multi-language switching. This article will introduce common techniques for using i18n to implement multi-language switching in Vue. Step 1: Install the i18n plug-in First, we need to install the i18n plug-in using npm or yarn. Enter the following command at the command line: npminst

What do out and in interfaces mean? What do out and in interfaces mean? Sep 28, 2021 pm 04:39 PM

The out interface refers to the output interface, and the in interface refers to the input interface. The out interface generally represents the audio source line output interface, which is used to connect loads, such as speakers, headphones, etc.; while the in interface generally represents the audio source line input interface, which is used to connect CD players, mobile phones, MP3 players, computers, etc.

OPPO Find X7 is a masterpiece! Capture your every moment with images OPPO Find X7 is a masterpiece! Capture your every moment with images Aug 07, 2024 pm 07:19 PM

In this fast-paced era, OPPO Find X7 can use its imaging power to let us savor every beautiful moment in life. Whether it's magnificent mountains, rivers, lakes, or seas, warm family gatherings, or encounters and surprises on the street, it can help you record them with "unparalleled" picture quality. From the outside, the camera Deco design of Find It looks very recognizable and has a high-end feel. The inside is also unique, starting with the basic hardware configuration. FindX7 maintains the previous

How to hide the select element in jquery How to hide the select element in jquery Aug 15, 2023 pm 01:56 PM

How to hide the select element in jquery: 1. hide() method, introduce the jQuery library into the HTML page, you can use different selectors to hide the select element, the ID selector replaces the selectId with the ID of the select element you actually use; 2. css() method, use the ID selector to select the select element that needs to be hidden, use the css() method to set the display attribute to none, and replace selectId with the ID of the select element.

Asynchronous processing method of Select Channels Go concurrent programming using golang Asynchronous processing method of Select Channels Go concurrent programming using golang Sep 28, 2023 pm 05:27 PM

Asynchronous processing method of SelectChannelsGo concurrent programming using golang Introduction: Concurrent programming is an important area in modern software development, which can effectively improve the performance and responsiveness of applications. In the Go language, concurrent programming can be implemented simply and efficiently using Channels and Select statements. This article will introduce how to use golang for asynchronous processing methods of SelectChannelsGo concurrent programming, and provide specific

OPPO Find X8 Ultra core configuration exposed! Snapdragon 8 Gen4+ Extra Large Battery OPPO Find X8 Ultra core configuration exposed! Snapdragon 8 Gen4+ Extra Large Battery Aug 22, 2024 pm 06:54 PM

On August 22, a digital blogger revealed some core configuration information of OPPO Find X8 Ultra. According to the exposed content, this high-end model will be equipped with Qualcomm’s latest Snapdragon 8Gen4 mobile platform, equipped with a 6000mAh ultra-large capacity battery, and supports 100W wired fast charging and 50W wireless fast charging functions. Appearance design There is currently no specific design information about OPPO Find X8 Ultra. But the real picture of the standard version of OPPO Find X8 has been exposed on the Internet. Appearance of FindX8 Judging from the exposed photos, the rear camera module of OPPO FindX8 adopts a square design with a certain degree of curvature at the four corners, giving a more rounded feeling. In addition, the machine adopts a direct

What are the string search and replace techniques in Python? What are the string search and replace techniques in Python? Oct 20, 2023 am 11:42 AM

What are the string search and replace techniques in Python? (Specific code example) In Python, strings are a common data type, and we often encounter string search and replace operations in daily programming. This article will introduce some common string search and replacement techniques, accompanied by specific code examples. To find a specific substring in a string, you can use the find() method or index() method of the string. The find() method returns the index of the first occurrence of the substring in the string.

See all articles