Home Backend Development PHP Tutorial 求教mysql批量更新有关问题

求教mysql批量更新有关问题

Jun 13, 2016 pm 01:39 PM
id set then where

求教mysql批量更新问题
我想批量更新数据,字段值也不同
例如:
set s=1 where id=1;
set s=2 where id=3;
这种情况除了逐条更新还有更好的方法吗?
因为一次更新有可能比较多
谢谢


------解决方案--------------------
UPDATE table
SET s = CASE id
WHEN 1 THEN '1'
WHEN 3 THEN '2'
END
WHERE id IN (1,3)

大概这样

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)

Fix event ID 55, 50, 98, 140 disk error in event viewer Fix event ID 55, 50, 98, 140 disk error in event viewer Mar 19, 2024 am 09:43 AM

If you find event ID 55, 50, 140 or 98 in the Event Viewer of Windows 11/10, or encounter an error that the disk file system structure is damaged and cannot be used, please follow the guide below to resolve the issue. What does Event 55, File system structure on disk corrupted and unusable mean? At session 55, the file system structure on the Ntfs disk is corrupted and unusable. Please run the chkMSK utility on the volume. When NTFS is unable to write data to the transaction log, an error with event ID 55 is triggered, which will cause NTFS to fail to complete the operation unable to write the transaction data. This error usually occurs when the file system is corrupted, possibly due to the presence of bad sectors on the disk or the file system's inadequacy of the disk subsystem.

This Apple ID is not yet in use in the iTunes Store: Fix This Apple ID is not yet in use in the iTunes Store: Fix Jun 10, 2024 pm 05:42 PM

When logging into iTunesStore using AppleID, this error saying "This AppleID has not been used in iTunesStore" may be thrown on the screen. There are no error messages to worry about, you can fix them by following these solution sets. Fix 1 – Change Shipping Address The main reason why this prompt appears in iTunes Store is that you don’t have the correct address in your AppleID profile. Step 1 – First, open iPhone Settings on your iPhone. Step 2 – AppleID should be on top of all other settings. So, open it. Step 3 – Once there, open the “Payment & Shipping” option. Step 4 – Verify your access using Face ID. step

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

Where can I find Alibaba ID? Where can I find Alibaba ID? Mar 08, 2024 pm 09:49 PM

In Alibaba software, once you successfully register an account, the system will assign you a unique ID, which will serve as your identity on the platform. But for many users, they want to query their ID, but don't know how to do it. Then the editor of this website will bring you detailed introduction to the strategy steps below. I hope it can help you! Where can I find the answer to Alibaba ID: [Alibaba]-[My]. 1. First open the Alibaba software. After entering the homepage, we need to click [My] in the lower right corner; 2. Then after coming to the My page, we can see [id] at the top of the page; Alibaba Is the ID the same as Taobao? Alibaba ID and Taobao ID are different, but the two

Event ID 4660: Object deleted [Fix] Event ID 4660: Object deleted [Fix] Jul 03, 2023 am 08:13 AM

Some of our readers encountered event ID4660. They're often not sure what to do, so we explain it in this guide. Event ID 4660 is usually logged when an object is deleted, so we will also explore some practical ways to fix it on your computer. What is event ID4660? Event ID 4660 is related to objects in Active Directory and will be triggered by any of the following factors: Object Deletion – A security event with Event ID 4660 is logged whenever an object is deleted from Active Directory. Manual changes – Event ID 4660 may be generated when a user or administrator manually changes the permissions of an object. This can happen when changing permission settings, modifying access levels, or adding or removing people or groups

Where to check Tencent Video ID Where to check Tencent Video ID Feb 24, 2024 pm 06:25 PM

Where can I check the Tencent Video ID? There is an exclusive ID in the Tencent Video APP, but most users do not know how to check the Tencent Video ID. Next is the graphic tutorial on how to check the Tencent Video ID brought by the editor for users who are interested. Users come and take a look! Tencent Video Usage Tutorial Where to check Tencent Video ID 1. First open the Tencent Video APP and enter the special area through [Personal Center] in the lower right corner of the main page; 2. Then enter the Personal Center page and select the [Settings] function; 3. Then go to Settings page, click [Exit Account] at the bottom; 4. Finally, you can view the exclusive ID number on the page shown below.

What should I do if vue cannot get the id attribute? What should I do if vue cannot get the id attribute? Jan 29, 2023 pm 02:03 PM

Vue cannot obtain the id attribute because getElementById is used in the "created()" hook function, and Vue has not completed mounting; the solution is to "created() {let serachBox = document.getElementById('searchBox') ;...}" code can be migrated to the "mounted()" hook function.

A Practical Guide to the Where Method in Laravel Collections A Practical Guide to the Where Method in Laravel Collections Mar 10, 2024 pm 04:36 PM

Practical Guide to Where Method in Laravel Collections During the development of the Laravel framework, collections are a very useful data structure that provide rich methods to manipulate data. Among them, the Where method is a commonly used filtering method that can filter elements in a collection based on specified conditions. This article will introduce the use of the Where method in Laravel collections and demonstrate its usage through specific code examples. 1. Basic usage of Where method

See all articles