Parts Example (Contd.)
Ranked queries:
- E.g., Customer may want “best matches first”: Find black widgets under $10, and give me the cheapest ones quickly.
- Ordering by cost is desirable (I.e., TOP N queries), but approximate answers acceptable: better to find several widgets under $10 anc close to the cheapest cost quickly than to wait a long time to make sure you have the very cheapest ones.
Of course, a gestalt table is a union of source definitions, so querying unions ...