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 businessess AS
(SELECT *
FROM public.businesses
UNION
SELECT *
FROM
public.new_businesses),
rank_table AS
(SELECT continent,
country,
business,
year_founded,
ROW_NUMBER()OVER (PARTITION BY continent ORDER BY year_founded) AS rank
FROM businessess b
INNER JOIN public.countries co
USING (country_code)
INNER JOIN public.categories ca
USING (category_code))
SELECT continent, country, business, year_founded
FROM rank_table
WHERE rank = 1;WITH businessess AS
(SELECT *
FROM public.businesses
UNION
SELECT *
FROM
public.new_businesses),
rank_table AS
(SELECT continent,
country,
business,
year_founded,
ROW_NUMBER()OVER (PARTITION BY continent ORDER BY year_founded) AS rank
FROM businessess b
FULL JOIN public.countries co
USING (country_code))
SELECT continent,
COUNT(distinct country) AS countries_without_businesses
FROM rank_table
WHERE business IS NULL
GROUP BY continent;WITH businessess AS (
SELECT *
FROM public.businesses
),
rank_table AS (
SELECT
co.continent,
ca.category,
b.year_founded
FROM businessess b
INNER JOIN public.countries co
ON b.country_code = co.country_code
INNER JOIN public.categories ca
ON b.category_code = ca.category_code
)
SELECT
continent,
category,
MIN(year_founded) AS year_founded
FROM rank_table
GROUP BY continent, category
ORDER BY continent, category;