A.
A virtual table is a relation created as the result of data manipulation; it exists only in computer memory, and is not a permanent part of the database.
B.
A virtual table is a relation stored in the database; it is used when multiple users access the same relation in a database.
C.
A virtual table is a relation derived from the database data dictionary; it contains metadata about a base relation. A virtual table is a relation derived from the database? data dictionary; it contains metadata about a base relation.
D.
A virtual table is a relation that consists of primary and foreign keys for a particular set of relations in a database.
Sorry I made a mistake in my first response.
Here is the correct answer:
A. A virtual table is a relation created as the result of data manipulation; it exists only in computer memory and is not a permanent part of the database.
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