Which operation is used to extract specified columns from a table?

20072007

Answer: A. Project — The operation used to extract specified columns from a table is the Project operation. In relational algebra, projection selects specific attributes (columns)…

A.
Project
B.
Join
C.
Extract
D.
Substitute

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Correct answer: A

The operation used to extract specified columns from a table is the Project operation. In relational algebra, projection selects specific attributes (columns) from a relation while keeping all rows intact.

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