2. In principle, there can be difficulties in judging whether or not a DBMS is “relational”. In practice, those difficulties don’t arise — yet. Every significant DBMS still falls into one of two categories:
Was designed to do relational stuff* from the get-go, even if it now does other things too.
Supports a lot of SQL.
Was designed primarily to do non-relational things.*
Doesn’t support all that much SQL.
*I expect the distinction to get more confusing soon, at which point I’ll adopt terms more precise than “relational things” and “relational stuff”.
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