For creating a view of the top 5 authors with the highest total book sales, what SQL command should the DBA use?

For creating a view of the top 5 authors with the highest total book sales, what SQL command should the DBA use?

• A. CREATE VIEW TopAuthors AS ...
• B. INSERT INTO TopAuthors ...
• C. CREATE TABLE TopAuthors AS ...
• D. ALTER VIEW TopAuthors AS ...

Answer: (A)

The correct choice involves using the CREATE VIEW command, which is specifically designed to define a new view in SQL. A view is essentially a virtual table that provides a way to present data derived from one or more tables without actually storing the data itself. In this scenario, the DBA wants to create a view that lists the top five authors based on their total book sales. Using CREATE VIEW allows the DBA to encapsulate a complex SQL query that calculates book sales for each author, aggregates that data, and filters the results to display only the top five authors. This means the view can dynamically reflect the latest data whenever it is accessed, making it a powerful tool for reporting and analysis. The other options are not suitable for this task. For instance, inserting data into an already existing view or table isn't appropriate for creating a view. Similarly, creating a new table would entail duplicating data rather than simply presenting it in a more useful format as a view would do. Lastly, altering an existing view is used for modifying its definition, which isn't relevant when establishing a new view from scratch. Thus, CREATE VIEW is the most fitting approach for achieving the desired outcome in this context.

The correct choice involves using the CREATE VIEW command, which is specifically designed to define a new view in SQL. A view is essentially a virtual table that provides a way to present data derived from one or more tables without actually storing the data itself. In this scenario, the DBA wants to create a view that lists the top five authors based on their total book sales.

Using CREATE VIEW allows the DBA to encapsulate a complex SQL query that calculates book sales for each author, aggregates that data, and filters the results to display only the top five authors. This means the view can dynamically reflect the latest data whenever it is accessed, making it a powerful tool for reporting and analysis.

The other options are not suitable for this task. For instance, inserting data into an already existing view or table isn't appropriate for creating a view. Similarly, creating a new table would entail duplicating data rather than simply presenting it in a more useful format as a view would do. Lastly, altering an existing view is used for modifying its definition, which isn't relevant when establishing a new view from scratch. Thus, CREATE VIEW is the most fitting approach for achieving the desired outcome in this context.