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Database - Distributed Databases - Discussion

Discussion Forum : Distributed Databases - General Questions (Q.No. 12)
Distributed Databases
12.
A semijoin is which of the following?
Only the joining attributes are sent from one site to another and then all of the rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
Only the joining attributes are sent from one site to another and then only the required rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
Answer: Option
Explanation:
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