CREATE TABLE Manufacturers (Code NUMBER, Name VARCHAR2, Headquarter VARCHAR2, Founder VARCHAR2, Revenue FLOAT)
CREATE TABLE Products (Code NUMBER, Name VARCHAR2, Price NUMBER, Manufacturer NUMBER)

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"