How to register parent and grandchild category in the database?

Hello, I would like to register a main category, a child category and a grandchild category, which would be linked to the main category, however, I don’t know how to do this in the database to be able to list in a repeater group, can someone help me?

Have a field that is of the same type as the main data type. So point one row on the table at another.

I didn’t understand friend. I’ll give you an example. There is the food category, within this category there is the snacks category and within the snacks category there is the ice cream category. I want it all tied together, but I don’t know how to list it in a repeater group simply.

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