ISRO2007-52

Question

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

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

Answer 1

To extract a specified row in a table we do select operation

To extract a specified column from a table we do project operation

Answer A)

Answer 2

Answer is Project

To choose a subset of columns in a relation Project operation is used

It is denoted as Π.

Answer 3

project

Answer 4

project is use to extract specified columns from a table it also eliminate dublicate .