This topic contains a solution. Click here to go to the answer

Author Question: What is a view? What will be an ideal response?[br][br][b][color=green]Question ... (Read 82 times)

ashley

  • Hero Member
  • *****
  • Posts: 584
What is a view?
 
  What will be an ideal response?

Question 2

Explain the term retrieval of analytical information in the following data warehouse definition:The data warehouse is a structured repository of integrated, subject-oriented, enterprise-wide, historical, and time-variant data.
 
  The purpose of the data warehouse is the retrieval of analytical information. A data warehouse can store detailed and/or summarized data.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

nixon_s

  • Sr. Member
  • ****
  • Posts: 359
Answer to Question 1

A view is a mechanism in SQL that allows the structure of a query to be saved in the RDBMS. A view, which is also known as a virtual table, is not an actual table and does not have any data physically saved. Every time a view is invoked, it executes a query that retrieves the data from the actual tables. A view can be used in SELECT statements just like any other table from a database.

Answer to Question 2

A data warehouse is developed for the retrieval of analytical information, and it is not meant for direct data entry by the users. The only functionality available to the users of the data warehouse is retrieval. The data in the data warehouse is not subject to modifications, insertions, or deletions by the end users. New data in the data warehouse is periodically loaded from the operational data sources and appended to the existing data in an automatic fashion. The data that eventually gets older than the required time horizon is automatically purged from the data warehouse (and possibly archived and/or summarized). However, the data in the data warehouse is not subject to changes. That is why the data in the data warehouse is referred to as nonvolatile, static, or read-only.




ashley

  • Member
  • Posts: 584
Reply 2 on: Jul 7, 2018
:D TYSM


recede

  • Member
  • Posts: 315
Reply 3 on: Yesterday
Excellent

 

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

For a complete list of videos, visit our video library