Has parent field in the table wp_term_taxonomy has term_id or term_taxonomy_id

Question

I have created a category "Book" with a sub category "comics", to check how wordpress is maintaining the hierarchy structure. When i check the table "wp_term_taxonomy", I found that such term with a parent has "parent" field populated . As the term id and term_taxonomy_id have the same value for the parent "term name" I am unable to crack whether in the table wp_term_taxonomy do the field, has term_taxonomy_id of the parent term or term_id of the parent

Answer 1

The parent column is the term_id of a parent term