我应该如何设计这个数据库？

Question

Let's say I have 10 millions of product names, eg iPhone 6. For each product name, there may be multiple comments or reviews. When users search for a product name, it will display all comments for it. Should I use two tables to fulfill this requirement?

Table one: ProductName, with only one column, "prodName" Table two: Comments, with only one column, "comments"

What's the relationship between the two? I am new to database design, and will use MySql to do this, Hibernate in Java. I am thinking to make it as simple as possible, to start with.

Thank you.

Answer 1

If you were to keep a single table for product information and comments for that product you would need to duplicate the product name for each comment made. When having to store 10 million products that can be very dangerous.

Another issue is table extensibility. Lets say you want to add another info, apart from the name, that is closely linked to the product ie stock. You do not want to have that info in your table duplicated based on the comments being made for that product.

To avoid these kind of issues you could consider an architecture similar to this: http://sqlfiddle.com/#!9/b50a8/2 , link your tables with their keys and avoid information duplication.