Question

What’s the most efficient way how to structure a database for an eshop with products with various sizes and colors?

Say I have a product, a T-shirt. For example, what should be the table/column structure if I then needed to display how many red t-shirts in size XXL are left?

Hope you can understand my question.

Thank you.

Answer 1

Tables:

tshirts(tshirt_id, brand, size_id, color_id);
size(size_id, size_value)
color(color_id, color_name)

This is with assumption that the T-shirts will have only one color and not the mix of colors :). If you want to associate more colors to a t-shirt, then you may have to introduce another table for one-to-many relationship between tshirt and color with a composite key.

tshirt_color(tshirt_id, color_id)