Nested Relations Summary
An early step on the way to OODBMS
No products, only prototypes, but:
- Many ideas from NF2 relations have survived
- Collection types in SQL3 (nesting, unnesting)
- Algebra ideas useful for Object Database QP
Can provide a more natural model of data
Are a straightforward extension of relations:
- many solutions are thus also straightforward
- formal foundation of relational model remains