"NoSQL" isn't a technology, though. It's an industry category. At that level of detail it'll all seem pretty confusing, I'm sure! Relational databases: decent

"NoSQL" isn't a technology, though. It's an industry category. At that level of detail it'll all seem pretty confusing, I'm sure! Relational databases: decent at everything Document databases: insane at saving and retrieving trees of data; bad at other things Graph databases: insane at deep relational queries (e.g. give me all my friends of friends of friends); bad at other things Columnar databases: insane at columnar operations; bad at other things