© 2015 Consort Institute, LLC. All right reserved. This material may not be reproduced, displayed, modified or distributed in any forms by any means without the express prior written permission of Consort Institute, LLC

MySQLWorld Database

by Robert Joseph, Ph.D.

ece.emory.edu | 404.727.6000 | ece@emory.edu

World Database

2

You are a new hire company Worldwide Furniture. As the name says this company does furniture sales all over the world.

Understanding different aspects of country, city and language information is essential for the sales team to be able to be

successful. If the sales team is not successful the company can not survive. Your predecessor created a world database but left no

documentation and did not complete the reporting. Your boss needs you to get the database back up and running then answer

some questions that still need to be answered. First think about what questions might a sales team have based on the database

you have access to. Then answer those questions you have developed as well as the set of questions that follow. Present your set

of findings using an excel spreadsheet.

1. Download world.sql file from world database at location https://dev.mysql.com/doc/index-other.html

2. In a text editor comment out the values below. These will create a different database that you don’t have the privledges:

/*

DROP SCHEMA IF EXISTS world;

CREATE SCHEMA world;

USE world;

SET AUTOCOMMIT=0;

*/

1. Import the modified file into your studentXXXX database

2. Develop a set of questions that you want to answer based on the data that you are given and combine those questions

with the ones that are listed.

3. Now map out the steps you will take to answer the questions that follow.

ece.emory.edu | 404.727.6000 | ece@emory.edu

One Method To AnswersThere is more than one way to get to the answer. What follows is just one method for getting the answers.

3

ece.emory.edu | 404.727.6000 | ece@emory.edu

1. You should now see 3 additional tables city, country and countrylanguage2. From this data create an ER Diagram

4

ece.emory.edu | 404.727.6000 | ece@emory.edu

Questions 1 - 61. How many countries are in the database

2. What are the top 10 largest countries

3. What are the top 10 GDP countries

4. What are the intersection between the two

5. For the above countries what is the % English

6. What is the top most populated countries

5

ece.emory.edu | 404.727.6000 | ece@emory.edu

Questions 7 - 107. What are the top 10 countries that have the smallest people to land ratio

8. What are the top 10 countries that have the largest people to land ratios

9. What are the countries that speak over 50% English

10. How many different languages are there

6

ece.emory.edu | 404.727.6000 | ece@emory.edu

Questions 11 - 1211. What is the number of languages are spoken in different country.

12. What are the top 10 languages spoken in different countries along with their count

7

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 1 - 31. How many countries are in the database

select count(distinct(name)) from country

2. What are the top 10 largest countriesselect name, SurfaceArea from country ORDER BY SurfaceArea desc Limit 10

3. What are the top 10 GDP countriesselect name, GNP from country ORDER BY GNP desc Limit 10

8

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 44. What are the intersection between the two

select GNP INTO @g from country ORDER BY GNP desc LIMIT 9,1;

SELECT SurfaceArea INTO @s from country Order By SurfaceArea desc Limit 9,1;

SELECT Name, GNP, SurfaceArea FROM country WHERE GNP > @g and SurfaceArea > @sORDER BY GNP desc;

9

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 55. For the above countries what is the % English

SELECT GNP INTO @g from country ORDER BY GNP desc LIMIT 9,1;

SELECT SurfaceArea INTO @s from country ORDER BY SurfaceArea desc LIMIT 9,1;

SELECT Name, GNP, SurfaceArea, Percentage FROM countryLEFT JOIN countrylanguage ON CountryCode = Code and language = 'English'WHERE GNP > @g and SurfaceArea > @sORDER BY GNP desc

10

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 6 - 76. What is the top most populated countries

SELECT name, Convert(Population,UNSIGNED INTEGER) as p FROM country ORDER BY p desc Limit 1,1

7. What are the top 10 countries that have the smallest people to land ratio

SELECT name, Population, SurfaceArea, (Population/SurfaceArea) as p FROM country ORDER BY p Desc Limit 0,9

11

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 88. What are the top 10 countries that have the largest people to land ratios

SELECT name, Population, SurfaceArea, (Population/SurfaceArea) as p FROM country ORDER BY p Asc Limit 0,9

12

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 9 - 109. What are the countries that speak over 50% English

SELECT Name, Language, Percentage FROM country, countrylanguage WHERE CountryCode = Code and

Language = "English" andPercentage > 50

ORDER BY Percentage desc

10. How many different languages are thereSELECT count(distinct(Language)) FROM `countrylanguage`

13

ece.emory.edu | 404.727.6000 | ece@emory.edu

Answers 11 - 12 11. What is the number of languages are spoken in different country.

SELECT language, count(language) as ct FROM countrylanguage GROUP BY language ORDER BY ct desc

12. What are the top 10 languages spoken in different countries along with their count

SELECT language, count(language) as ct FROM countrylanguage GROUP BY language ORDER BY ct desc LIMIT 1, 10

14

© 2015 Consort Institute, LLC. All right reserved. This material may not be reproduced, displayed, modified or distributed in any forms by any means without the express prior written permission of Consort Institute, LLC

Live Long and Prosper