One fundamental issue I’ve noticed is that typical SQL databases have a single schema per table defining both the logical and physical aspects, typically with a strong correlation between the two.
Databases could treat the columns as the fundamental unit with tables being not much more than a view of a bunch of columns that can change over both space (partitioning) and time (history).
That’s effectively how datomic works. Datoms are the fundamental unit, with attributes being analogous to a column name and views being the 4 indexes that datomic keeps
Databases could treat the columns as the fundamental unit with tables being not much more than a view of a bunch of columns that can change over both space (partitioning) and time (history).