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

Bar graph to show sum revenue from different name, and show from high to low by the x axis.
SELECT Name, SUM(Revenue) FROM Manufacturers GROUP BY Name ORDER BY Name DESC
SELECT "Name", SUM("Revenue") FROM "Manufacturers" GROUP BY "Name" ORDER BY "Name" DESC NULLS LAST