Another SQL-3 Example

• Find theaters showing Herbert films within 100 km of Andorra:

• theater attribute of nowshowing: ref to an object in another table. Use -> as shorthand for deref(theater).name
• set-valued attributes get compared using set methods

select N.theater->name, N.theater->address, F.name

from nowshowing N, frames F, countries C

where N.film = F.filmno

and Radius(N.theater->location, 100) || C.boundary

and C.name = ‘Andorra’

and F.stars ' ‘Herbert the Worm’

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