Which operation is used to extract specified columns from a table?
20072007
Which operation is used to extract specified columns from a table?
- 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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