MySQL示例数据库(MySQL Sample Databases) 之 World数据库

官方示例数据介绍

MySQL 官方提供了多个示例数据库，在MySQL的学习、开发和实践中具有非常重要的作用，能够帮助初学者更好地理解和应用MySQL的各种功能和特性。

官方示例数据具体列表如下：

1. employee data (large dataset, includes data and test/verification suite)
2. world database
3. world_x database
4. sakila database
5. airportdb database (large dataset, intended for MySQL on OCI and HeatWave)	
6. menagerie database

这些数据库都可以通过如下官方网址进行下载和安装

https://dev.mysql.com/doc/index-other.html

World数据库

MySQL官方网站提供的示例数据库 world Database，包含了一个关于国家、城市和语言的实际数据集。该数据库包含了以下三个表：

1. country：
   该表包含了全球所有国家的信息，包括国家名称、首都、人口、面积、所属洲别等信息。

2. city：
   该表包含了世界各国的城市信息，包括所属国家、城市名称、人口等信息。

3. countrylanguage：
   该表包含了全球各国语言的信息，包括所属国家、语言名称、官方语言等信息。

通过这三个表之间的连结和查询，可以实现各种复杂的跨表查询功能，例如根据某个国家的首都查询该国家的语言、或者查询某个语言在全球范围内被哪些国家使用等等。

world Database提供了一个非常实用的数据集，可以帮助开发人员更好地理解MySQL的查询语句、表关联和查询优化等概念。同时，通过该数据集，用户还可以编写实际的SQL查询语句以及应用程序，提高自己的MySQL编程技能。

World 数据库安装

下载压缩包后就可以解压安装了。
解压：

ubuntu@mysql-vm:~$ unzip world-db.zip
Archive:  world-db.zip
   creating: world-db/
  inflating: world-db/world.sql

安装：

ubuntu@mysql-vm:~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 8.0.32-0ubuntu0.22.04.2 (Ubuntu)

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> source world-db/world.sql

查看数据

mysql> use world;
Database changed
mysql> show tables;
+-----------------+
| Tables_in_world |
+-----------------+
| city            |
| country         |
| countrylanguage |
+-----------------+
3 rows in set (0.01 sec)

ubuntu@mysql-vm:~$ mysqlshow -uroot  -prootroot -vv world
mysqlshow: [Warning] Using a password on the command line interface can be insecure.
Database: world
+-----------------+----------+------------+
|     Tables      | Columns  | Total Rows |
+-----------------+----------+------------+
| city            |        5 |       4079 |
| country         |       15 |        239 |
| countrylanguage |        4 |        984 |
+-----------------+----------+------------+
3 rows in set.

world-db/world.sql的脚本内容

-- MySQL dump 10.13  Distrib 8.0.19, for osx10.14 (x86_64)
--
-- Host: 127.0.0.1    Database: world
-- ------------------------------------------------------
-- Server version	8.0.19-debug

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!50503 SET NAMES utf8mb4 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
SET @old_autocommit=@@autocommit;

--
-- Current Database: `world`
--

/*!40000 DROP DATABASE IF EXISTS `world`*/;

CREATE DATABASE `world` DEFAULT CHARACTER SET utf8mb4;

USE `world`;

--
-- Table structure for table `city`
--

DROP TABLE IF EXISTS `city`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `city` (
  `ID` int NOT NULL AUTO_INCREMENT,
  `Name` char(35) NOT NULL DEFAULT '',
  `CountryCode` char(3) NOT NULL DEFAULT '',
  `District` char(20) NOT NULL DEFAULT '',
  `Population` int NOT NULL DEFAULT '0',
  PRIMARY KEY (`ID`),
  KEY `CountryCode` (`CountryCode`),
  CONSTRAINT `city_ibfk_1` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `city`
--
-- ORDER BY:  `ID`

set autocommit=0;
INSERT INTO `city` VALUES (1,'Kabul','AFG','Kabol',1780000);
...
commit;

--
-- Table structure for table `country`
--

DROP TABLE IF EXISTS `country`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `country` (
  `Code` char(3) NOT NULL DEFAULT '',
  `Name` char(52) NOT NULL DEFAULT '',
  `Continent` enum('Asia','Europe','North America','Africa','Oceania','Antarctica','South America') NOT NULL DEFAULT 'Asia',
  `Region` char(26) NOT NULL DEFAULT '',
  `SurfaceArea` decimal(10,2) NOT NULL DEFAULT '0.00',
  `IndepYear` smallint DEFAULT NULL,
  `Population` int NOT NULL DEFAULT '0',
  `LifeExpectancy` decimal(3,1) DEFAULT NULL,
  `GNP` decimal(10,2) DEFAULT NULL,
  `GNPOld` decimal(10,2) DEFAULT NULL,
  `LocalName` char(45) NOT NULL DEFAULT '',
  `GovernmentForm` char(45) NOT NULL DEFAULT '',
  `HeadOfState` char(60) DEFAULT NULL,
  `Capital` int DEFAULT NULL,
  `Code2` char(2) NOT NULL DEFAULT '',
  PRIMARY KEY (`Code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `country`
--
-- ORDER BY:  `Code`

set autocommit=0;
INSERT INTO `country` VALUES ('ABW','Aruba','North America','Caribbean',193.00,NULL,103000,78.4,828.00,793.00,'Aruba','Nonmetropolitan Territory of The Netherlands','Beatrix',129,'AW');
...
commit;

--
-- Table structure for table `countrylanguage`
--

DROP TABLE IF EXISTS `countrylanguage`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `countrylanguage` (
  `CountryCode` char(3) NOT NULL DEFAULT '',
  `Language` char(30) NOT NULL DEFAULT '',
  `IsOfficial` enum('T','F') NOT NULL DEFAULT 'F',
  `Percentage` decimal(4,1) NOT NULL DEFAULT '0.0',
  PRIMARY KEY (`CountryCode`,`Language`),
  KEY `CountryCode` (`CountryCode`),
  CONSTRAINT `countryLanguage_ibfk_1` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `countrylanguage`
--
-- ORDER BY:  `CountryCode`,`Language`

set autocommit=0;
INSERT INTO `countrylanguage` VALUES ('ABW','Dutch','T',5.3);
...
commit;

--
-- Dumping events for database 'world'
--

--
-- Dumping routines for database 'world'
--
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
SET autocommit=@old_autocommit;

-- Dump completed on 2020-01-22  9:56:18

参考

https://dev.mysql.com/doc/world-setup/en/