Entity-attribute-value Questions

I have a database with the eav entity-attribute-value model, if there is the same data how do i only display the same data once? for example i

Database beginner here. i've been researching column-store model for a while, i came up to

I have product that have more attribute (for example color,size,material) that each attribute have value (for example color have 4 value or

I know this might sound a bit ridiculous, but i got a doubt that if we can represent relationship between two tables, how the two table's data is

I am a beginner and this is my first real project. the below image shows what i have been trying to reach. but it got way complicated so fast and

Is it necessary to set the attributes _media_image with _media_attribute_id in the csv to be uploaded?

I'm in the process of making an application that among other stuff, also has a user info management section. there are 10 basic fields that the