48. Calculating Product Sales

This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.
 

A store that sells M&M’S products manages two major tables.
The first table specifies the various products and their number in the inventory:

CREATE TABLE products_stock
(productID int identity(1,1),     
 productName varchar(150),     
 unitsInStock int    
)    
GO    

The second table specifies the sales of these products:

CREATE TABLE products_sales    
(saleID int identity(1,1),    
 productID int,    
 unitsSold int,     
 customerID int    
)    

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