If you have a mix of "normal" relational data and some hierarchical data then it absolutely makes sense to stick with a relational database. And why use a full

If you have a mix of "normal" relational data and some hierarchical data then it absolutely makes sense to stick with a relational database. And why use a full blown graph database if just want to model (and query) a strictly hierarchical structure? e.g. categories that can contain categories or similar things. And it's part of the SQL standard, so it makes sense to add it to be more compliant with it.