What is the difference between materialized view and view in teradata

This indicates the materialized view is returning a physically separate copy of the table data This is the major difference between View and Materialized View A view takes the output of a query and makes it appear like a virtual table. You can use a view in most places where a table can be used. All operations performed on a view will affect data in the base table and so are subject to the integrity constraints and triggers of the base table.

A View can be used to simplify SQL statements for the user or to isolate an application from any future change to the base table definition. A View can also be used to improve security by restricting access to a predetermined set of rows or columns. Materialized views are schema objects that can be used to summarize, precompute, replicate, and distribute data. A materialized view provides indirect access to table data by storing the results of a query in a separate schema object.

Sum party income As salary- total. Avg Party income As salary- Average. Views with Check Option. The with check option prevents rows from being inserted or updated via the view if the resulting rows fall outside the view.

Create view dept — budget as. Select party id party name from the party. Insert into dept — budget party id, party income values , ;. Teradata Interview Questions. Derived and aggregate column must be assigned as the name. What is Materialized View in a Database? Materialized views are also the logical view of our data-driven by the select query but the result of the query will get stored in the table or disk, also the definition of the query will also store in the database.

When we see the performance of Materialized view it is better than normal View because the data of materialized view will be stored in table and table may be indexed so faster for joining also joining is done at the time of materialized views refresh time so no need to every time fire joins statement as in case of view. See Oracle Database 12c Fundamentals , an online course from Pluralsight to learn more about how Oracle database stores Views.

I suggest always preparing this question in good detail and if you can get some hands-on practice like creating Views, getting data from Views then try that as well. Labels: database , sql , SQL interview Question. Anonymous October 12, at PM. Unknown December 30, at PM. Ravi May 18, at AM. Anonymous October 26, at AM.

As Views does not have any storage cost associated with it so they also does not have any update cost associated with it. On other hand Materialized Views does have a storage cost associated with it so also have update cost associated with it. Views in SQL are designed with a fixed architecture approach due to which there is an SQL standard of defining a view.

On other hand in case of Materialized Views in SQL are designed with a generic architecture approach so there is no SQL standard for defining it,and its functionality is provided by some databases systems as an extension.