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df
variable
SELECT * FROM companies

Did you know that the average return from investing in stocks is 10% per year! But who wants to be average?!

You have been asked to support an investment firm by analyzing trends in high-growth companies. They are interested in understanding which industries are producing the highest valuations and the rate at which new high-value companies are emerging. Providing them with this information gives them a competitive insight as to industry trends and how they should structure their portfolio looking forward.

You have been given access to their unicorns database, which contains the following tables:

dates

ColumnDescription
company_idA unique ID for the company.
date_joinedThe date that the company became a unicorn.
year_foundedThe year that the company was founded.

funding

ColumnDescription
company_idA unique ID for the company.
valuationCompany value in US dollars.
fundingThe amount of funding raised in US dollars.
select_investorsA list of key investors in the company.

industries

ColumnDescription
company_idA unique ID for the company.
industryThe industry that the company operates in.

companies

ColumnDescription
company_idA unique ID for the company.
companyThe name of the company.
cityThe city where the company is headquartered.
countryThe country where the company is headquartered.
continentThe continent where the company is headquartered.
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DataFrameas
df4
variable
SELECT * 
FROM funding
LIMIT 5;
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DataFrameas
df5
variable
SELECT * FROM industries
LIMIT 5;
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DataFrameas
df6
variable
SELECT * FROM companies
LIMIT 5;
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DataFrameas
df2
variable
SELECT 
i.industry, 
EXTRACT(YEAR FROM d.date_joined) AS year,
COUNT(c.company_id) AS num_unicorns, 
ROUND(AVG(f.valuation)/1000000000, 2) AS average_valuation_billions
FROM companies as c

INNER JOIN industries AS i USING(company_id)
	INNER JOIN dates AS d USING(company_id)
	INNER JOIN funding AS f USING(company_id)
WHERE EXTRACT(YEAR FROM d.date_joined) IN (2019,2020,2021)
GROUP BY i.industry, year
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DataFrameas
df3
variable
SELECT 
i.industry, 
EXTRACT(YEAR FROM d.date_joined) AS year,
COUNT(c.company_id) AS num_unicorns, 
ROUND(AVG(f.valuation)/1000000000, 2) AS average_valuation_billions
FROM companies as c

INNER JOIN industries AS i USING(company_id)
	INNER JOIN dates AS d USING(company_id)
	INNER JOIN funding AS f USING(company_id)
WHERE EXTRACT(YEAR FROM d.date_joined) IN (2019,2020,2021)
AND i.industry IN
			(SELECT i.industry
			 FROM companies AS c
			INNER JOIN industries i ON c.company_id = i.company_id
			INNER JOIN dates d ON c.company_id = d.company_id
			WHERE EXTRACT(YEAR FROM d.date_joined) BETWEEN 2019 AND 2021
			GROUP BY i.industry, 
			EXTRACT(YEAR FROM d.date_joined)
			ORDER BY COUNT(c.company_id) DESC
			LIMIT 3)
GROUP BY 
	i.industry, EXTRACT(YEAR FROM d.date_joined);
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DataFrameas
df1
variable
SELECT 
i.industry, 
EXTRACT(YEAR FROM d.date_joined) AS year,
COUNT(c.company_id) AS num_unicorns, 
ROUND(AVG(f.valuation)/1000000000, 2) AS average_valuation_billions
FROM companies as c

INNER JOIN industries AS i USING(company_id)
	INNER JOIN dates AS d USING(company_id)
	INNER JOIN funding AS f USING(company_id)
WHERE EXTRACT(YEAR FROM d.date_joined) IN (2019,2020,2021)

AND i.industry IN
			(SELECT i.industry
			 FROM companies AS c
			INNER JOIN industries i ON c.company_id = i.company_id
			INNER JOIN dates d ON c.company_id = d.company_id
			WHERE EXTRACT(YEAR FROM d.date_joined) BETWEEN 2019 AND 2021
			GROUP BY i.industry, 
			EXTRACT(YEAR FROM d.date_joined)
			ORDER BY COUNT(c.company_id) DESC
			LIMIT 3)
GROUP BY 
	i.industry,
	EXTRACT(YEAR FROM d.date_joined)
ORDER BY
	i.industry,
	year DESC;