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?
WITH all_businesses AS (
SELECT
c.continent,
c.country,
b.business,
b.year_founded
FROM public.businesses as b
INNER JOIN public.countries AS c
USING (country_code)
),
min_year AS (
SELECT
c.continent,
MIN(b.year_founded) AS year_founded
FROM public.businesses AS b
INNER JOIN public.countries AS c
USING (country_code)
GROUP BY c.continent
)
SELECT
ab.continent,
ab.country,
ab.business,
my.year_founded
FROM all_businesses AS ab
INNER JOIN min_year AS my
ON ab.continent = my.continent AND ab.year_founded = my.year_founded-- How many countries per continent lack data on the oldest businesses
-- Does including the `new_businesses` data change this?
WITH all_businesses AS (
SELECT *
FROM public.businesses
UNION ALL
SELECT *
FROM public.new_businesses
),
country_info AS (
SELECT *
FROM all_businesses AS ab
RIGHT JOIN public.countries AS c
USING (country_code)
ORDER BY country_code
)
SELECT
continent,
COUNT(*) AS countries_without_businesses
FROM country_info
WHERE business IS NULL
GROUP BY continent-- Which business categories are best suited to last over the course of centuries?
WITH all_businesses AS (
SELECT * FROM public.businesses
),
categories_info AS (
SELECT *
FROM all_businesses AS ab
INNER JOIN countries
USING(country_code)
INNER JOIN public.categories AS c
USING(category_code)
)
SELECT
continent,
category,
MIN(year_founded) AS year_founded
FROM categories_info
GROUP BY continent, category
ORDER BY continent, category