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Help with Relational Algebra

Hello Guys...
thanks in advance jst wondering if any1 knows answer to this....
if this is the SQL query

Author(name, hometown, publisher)
Textbook(tname, aname, price)
select A.name, publisher from Author A, Textbook T
where T.aname = A.name and not exists (select * from Textbook S
where S. price > T.price);


What would be an efficient relational algebra????? so that there are minimal tuples to be processed...
Oct 12 '06 #1
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