Discussion
In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.
Answer: A
Correct answer: True
This is the definition. The joining attribute alone is sent to the other site, which matches it against its own rows and returns only those that participate in the join. The saving comes from restricting both what is sent and what comes back, and it is what makes distributed joins practicable over a slow link.
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