CREATE TABLE Manufacturers (Code INT, Name VARCHAR, Headquarter VARCHAR, Founder VARCHAR, Revenue FLOAT)
CREATE TABLE Products (Code INT, Name VARCHAR, Price DECIMAL, Manufacturer INT)

Find the total revenue of companies of each founder. Visualize by bar chart.
SELECT Founder, SUM(Revenue) FROM Manufacturers GROUP BY Founder
SELECT "Founder", SUM("Revenue") FROM "Manufacturers" GROUP BY "Founder"