the semijoin, as follows: Given this, the antijoin is sometimes called the anti-semijoin, and the antijoin operator is sometimes written as semijoin symbol...

(alpha-)acyclic conjunctive queries, see GYO algorithm). It first uses semijoins to prune tuples that cannot participate in any answer and then joins the...

1060606, ISBN 978-1581139600, S2CID 56473 Mullin, James K. (1990), "Optimal semijoins for distributed database systems", IEEE Transactions on Software Engineering...