PostgreSQL has used this term for decades! The oldest I can find is from 1998 (PostgreSQL 6.3), but it was probably in use even before. > Postgres offers subs

PostgreSQL has used this term for decades! The oldest I can find is from 1998 (PostgreSQL 6.3), but it was probably in use even before. > Postgres offers substantial additional power by incorporating the following four additional basic concepts in such a way that users can easily extend the system: classes inheritance types functions Other features provide additional power and flexibility: constraints triggers rules transaction integrity These features put Postgres into the category of databases referred to as object-relational https://www.postgresql.org/docs/6.3/c0101.htm https://www.postgresql.org/docs/6.3/c0101.htm