Company B has created an e-commerce site using DynamoDB and is designing a table named Products that includes items purchased by users. There are thousands of users and dozens of products. The table only has the partition key and does not have the sort key. When creating the table, which of the following is the most suitable to be selected as the partition key?

Answer options:

A.user_id
B.product_id
C.category_id
D.None of the above

Answer – A
When defining primary keys, you should always use the "many to few" principle. There are thousands of users but only a few products and categories. Hence, option A is the best answer. For a table item, you can fill in all the products purchased for a user.
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