求助数据库,那个大神能解决
sql 数据库
有一张表 :id 时间 地区 价格
1 2001 上海 5
2 2001 上海 5
2 2001 山东 6
3 2002 上海 8
4 2002 山东 9
7 2003 山东 10
8 2003 上海 空
想将它扫描出来放在前台页面成这样
时间 上海 山东
2001 5 6
2002 8 9
2003 10
回复讨论(解决方案)
这个用到存储过程的,不然应该实现不了,除非你知道有几个地区,比如你就上海跟山东这2个地区,那可以用一句弄出来!
看看其他大神有没有好的方法!
CREATE TABLE `mytable` ( id int, 时间 varchar(4), 地区 varchar(50), 价格 decimal);insert into mytable select 1,'2001','上海', 5union allselect 2,'2001','上海', 5 union allselect 2,'2001','山东', 6union allselect 3,'2002','上海', 8 union allselect 4,'2002','山东', 9union allselect 7,'2003','山东', 10union allselect 8,'2003','上海', null;select * from mytable;select 时间,( case 地区 when '上海' then 价格 else null end) as '上海',( case 地区 when '山东' then 价格 else null end) as '山东'from mytablegroup by 时间;
$rs = mysql_query('select * from tbl_name');while($r = mysql_fetch_assoc($rs)) { $res[$r['时间']][$r['地区']] = $r['价格'];}$t = array_keys(current($res));echo "\t" . join("\t", $t) . "\n";foreach($res as $k=>$r) { echo $k; foreach($t as $v) echo "\t{$r[$v]} "; echo "\n";
上海 山东2001 5 6 2002 8 9 2003 10
CREATE TABLE `mytable` ( id int, 时间 varchar(4), 地区 varchar(50), 价格 decimal);insert into mytable select 1,'2001','上海', 5union allselect 2,'2001','上海', 5 union allselect 2,'2001','山东', 6union allselect 3,'2002','上海', 8 union allselect 4,'2002','山东', 9union allselect 7,'2003','山东', 10union allselect 8,'2003','上海', null;select * from mytable;select 时间,( case 地区 when '上海' then 价格 else null end) as '上海',( case 地区 when '山东' then 价格 else null end) as '山东'from mytablegroup by 时间;
这个就是假设地区是已知的(只要山东与上海2个地区),不具备通用性!
参考这个帖子第4种方法 http://www.cnblogs.com/lhj588/archive/2012/06/15/2550392.html
楼上的方法都不错,学习了

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

AI Hentai Generator
Generate AI Hentai for free.

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 PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Alipay PHP...

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.

The article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...
