Staffelter Hof Winery is Germany's oldest business, established in 862 under the Carolingian dynasty. It has continued to serve customers through dramatic changes in Europe, such as the Holy Roman Empire, the Ottoman Empire, and both world wars. What characteristics enable a business to stand the test of time?
To help answer this question, BusinessFinancing.co.uk researched the oldest company still in business in almost every country and compiled the results into several CSV files. This dataset has been cleaned.
Having useful information in different files is a common problem. While it's better to keep different types of data separate for data storage, you'll want all the data in one place for analysis. You'll use joining and data manipulation to work with this data and better understand the world's oldest businesses.
The Data
businesses and new_businesses
| Column | Description |
|---|---|
business | Name of the business (varchar) |
year_founded | Year the business was founded (int) |
category_code | Code for the business category (varchar) |
country_code | ISO 3166-1 three-letter country code (char) |
countries
| Column | Description |
|---|---|
country_code | ISO 3166-1 three-letter country code (varchar) |
country | Name of the country (varchar) |
continent | Name of the continent the country exists in (varchar) |
categories
| Column | Description |
|---|---|
category_code | Code for the business category (varchar) |
category | Description of the business category (varchar) |
-- What is the oldest business on each continent?
SELECT
c.continent,
c.country,
b.business,
b.year_founded
FROM businesses AS b
INNER JOIN countries AS c
USING(country_code)
WHERE b.year_founded = (
SELECT
MIN(year_founded)
FROM businesses
INNER JOIN countries AS c2
USING(country_code)
WHERE c2.continent = c.continent
)-- How many countries per continent lack data on the oldest businesses
-- Does including the `new_businesses` data change this?
SELECT
continent,
COUNT(*) AS countries_without_businesses
FROM public.countries AS c
LEFT JOIN (
SELECT *
FROM public.businesses
UNION
SELECT *
FROM public.new_businesses) AS b
USING(country_code)
WHERE business IS NULL
GROUP BY continent-- Which business categories are best suited to last over the course of centuries?
SELECT
continent,
category,
year_founded
FROM businesses AS b
INNER JOIN public.categories AS c2
USING(category_code)
INNER JOIN public.countries AS c
USING(country_code)
WHERE year_founded = (
SELECT
MIN(year_founded)
FROM businesses AS b2
INNER JOIN public.countries AS c3
USING(country_code)
INNER JOIN public.categories AS c4
USING(category_code)
WHERE c3.continent = c.continent AND c4.category_code = c2.category_code
)
GROUP BY 1, 2, 3
ORDER BY 1, 2