SELECT Founder, SUM(Revenue) FROM Manufacturers GROUP BY Founder
What is the total revenue of companies started by founder. Plot them as bar chart.
CREATE TABLE Products (
    Code INTEGER,
    Name VARCHAR(255),
    Price DECIMAL,
    Manufacturer INTEGER
)

CREATE TABLE Manufacturers (
    Code INTEGER,
    Name VARCHAR(255),
    Headquarter VARCHAR(255),
    Founder VARCHAR(255),
    Revenue REAL
)