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Author Question: Identify and describe the three basic operations used to extract useful sets of data from a ... (Read 26 times)

Bernana

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on: Jul 7, 2018
Identify and describe the three basic operations used to extract useful sets of data from a relational database?
 
  What will be an ideal response?

Question 2

The effort required to locate a suitable product is called:
 
  A) price discrimination.
  B) search costs.
  C) menu costs.
  D) shopping costs.
  E) market entry costs.
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Athena23

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Reply #1 on: Jul 7, 2018
Answer to Question 1

The select operation creates a subset consisting of all records (rows) in the table that meet stated criteria. The join operation combines relational tables to provide the user with more information than is available in individual tables. The project operation creates a subset consisting of columns in a table, permitting the user to create new tables that contain only the information required.

Answer to Question 2

B


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