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Table Activities: +-------------+---------+ | Column Name | Type | +-------------+---------+ | sell_date | date | | product | varchar | +-------------+---------+ There is no primary key for this table, it may contain duplicates. Each row of this table contains the product name and the date it was sold in a market. Write an SQL query to find for each date the number of different products sold and..

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Table: Customer +-------------+---------+ | Column Name | Type | +-------------+---------+ | customer_id | int | | product_key | int | +-------------+---------+ There is no primary key for this table. It may contain duplicates. product_key is a foreign key to Product table. Table: Product +-------------+---------+ | Column Name | Type | +-------------+---------+ | product_key | int | +----------..

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