Distributed Databases
Some of the columns of a relation are at different sites is which of the following?

Horizontal and Vertical Partitioning
Vertical Partitioning
Horizontal Partitioning
Data Replication

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Distributed Databases
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.

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