Database Normalization/Design

Question:
I have the following fields: productid, category.

A product can be in many categories, and a category can have many products. For example, product1 can be under category1 and category2. I don’t want to have to enter a duplicate entry for every new category.

Which is the most efficient way of designing the database? (I’m using MySQL.)

Answer:
It seems that you have to accommodate a many-to-many relationship. Break these down into two one-to-many relationships.

You will need three tables to satisfy the problem:

  • Products[ProductID, ProductDescription]
  • Categories[CategoryID, CategoryDescription]
  • ProdCat[ProductID, CategoryID]

This will let you record your products in one table without repetition, record the categories in another table without repetition, and record the various connections between them in the ProdCat table. How you read the direction of the relation will reveal what products are in what categories as well as the other way round.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job