A few comments about SchemeQL

[Shriram Krishnamurthi <shriram@cs.rice.edu>]

Noel Welsh wrote:

> I'd like a query to be first class object that could be parameterised,
> and combined w/ intersection, union, outer join and negation to create
> new queries.

Well, sure.  But the whole name of the game in databases is the
trade-off between expressivity and efficiency.  First-class queries
are mighty hard to optimize (though one of the most interesting recent 
developments in databases is the use of combinatory logic for
optimization).

Shriram