Is a relational database really all that much different from a file system? At the end of the day isn't a directory pretty much like a table? And you tie data t

Is a relational database really all that much different from a file system? At the end of the day isn't a directory pretty much like a table? And you tie data together with their common id, or file name? I think there is a difference, especially in practice. Relations are a first class citizen in relational databases. Integrity is enforced. Most types of operations can be bundled up in transactions. That abstraction differs from non relational data stores and you have to design your application to fit it.