繁體中文当前位置: 首页 > 图文教程 > 数据库 > MYSQL > MySQL 查找价格最高的图书经销商的几种SQL语句
- MYSQL
- 图片通过asp.net上传到mysql数据库的方法
- mysql教程之存储
- 用来分析、监控和变换通信数据MySQL-Proxy
- MySQL教程：相关的环境变量
- MySQL新功能测试
- MySQL数据库规范化设计
- MySQL故障检测和修正的一般过程
- 写给菜鸟站长：解读你的茫然
- 如何取得MYSQL中ENUM列的全部可能值
- mysql基础教程：安装与操作
- phpMyAdmin安装方法及介绍
- MySQL：改善数据装载效率的策略分析
- 为MySQL数据库换挡加速
- MySQL参数是如何设置的
- mysql中如何随机提取数据库记录
- Windows下MySQL安全权限设置
- WordPress基础，让你全面了解WordPress
- Photoshop教程：绘制著名博客程序的LOGO
- PHP通过SQL语句将数据写入MySQL数据库指定的表
- Six6免费空间，6G容量，无限月流量
MYSQL 中的 MySQL 查找价格最高的图书经销商的几种SQL语句
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 102 ::
收藏到网摘: n/a
不同的图书，在不同的经销商的价格不同，我们这里要找到每种图书最高的经销商是谁？ 找最低的类似了。 mysql> use test;
Database changed
mysql> CREATE TABLE shop (
-> article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL,
-> dealer CHAR(20) DEFAULT '' NOT NULL,
-> price DOUBLE(16,2) DEFAULT '0.00' NOT NULL,
-> PRIMARY KEY(article, dealer));
Query OK, 0 rows affected (0.13 sec)
mysql> INSERT INTO shop VALUES
-> (1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45),
-> (3,'C',1.69),(3,'D',1.25),(4,'D',19.95);
Query OK, 7 rows affected (0.03 sec)
Records: 7 Duplicates: 0 Warnings: 0
mysql> select * from shop;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
| 0001 | A | 3.45 |
| 0001 | B | 3.99 |
| 0002 | A | 10.99 |
| 0003 | B | 1.45 |
| 0003 | C | 1.69 |
| 0003 | D | 1.25 |
| 0004 | D | 19.95 |
+---------+--------+-------+
7 rows in set (0.06 sec)
mysql> select article,max(price) from shop group by article
-> ;
+---------+------------+
| article | max(price) |
+---------+------------+
| 0001 | 3.99 |
| 0002 | 10.99 |
| 0003 | 1.69 |
| 0004 | 19.95 |
+---------+------------+
4 rows in set (0.05 sec)
mysql> select article,max(price),dealer from shop group by article;
+---------+------------+--------+
| article | max(price) | dealer |
+---------+------------+--------+
| 0001 | 3.99 | A |
| 0002 | 10.99 | A |
| 0003 | 1.69 | B |
| 0004 | 19.95 | D |
+---------+------------+--------+
4 rows in set (0.00 sec)
mysql> select article,dealer,price from shop s1
-> where price=(select max(s2.price) from shop s2
-> where s1.article=s2.article);
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
| 0001 | B | 3.99 |
| 0002 | A | 10.99 |
| 0003 | C | 1.69 |
| 0004 | D | 19.95 |
+---------+--------+-------+
4 rows in set (0.01 sec)
mysql> select s1.article,dealer,s1.price
-> from shop s1
-> join(
-> select article,max(price) as price from shop
-> group by article) as s2
-> on s1.article = s2.article and s1.price = s2.price;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
| 0001 | B | 3.99 |
| 0002 | A | 10.99 |
| 0003 | C | 1.69 |
| 0004 | D | 19.95 |
+---------+--------+-------+
4 rows in set (0.05 sec)
mysql> select s1.article,s1.dealer,s1.price from shop s1
-> left join shop s2 on s1.article=s2.article and s1.price select s1.article,s1.dealer,s1.price,s2.* from shop s1 left join shop s2
on s1.article=s2.article and s1.price
评论 (0) All
