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(g) Names of products that have not been ordered.
(h) Names of customers who bought all products.
(j) Name of categories and the average price of products in each
category.
(k) Identifier and name of the companies that provide more than three
products.
(l) Identifier, name, and total sales of employees ordered by employee
identifier.
(m) Name of employees who sell the products of more than seven
suppliers.
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