Do You Know Views In SQL Server?

Yes, we can create an index on a view. A view is a virtual table that is based on the result of a query. While the view itself does not store any data, it can be used to simplify complex queries or provide a customized view of the data. By creating an index on a view, we can improve the performance of queries that involve the view by allowing the database to retrieve the data more efficiently.

In an updatable view, only one base table is affected. This means that any updates made to the view will only modify the data in one specific table, rather than affecting multiple tables. This is because an updatable view is a virtual table that is derived from one or more base tables, and any changes made to the view are ultimately reflected in the corresponding base table. Therefore, the correct answer is "only one base table".

Derived columns are not updatable in SQL Server View. A derived column is a column that is calculated based on other columns in the view. Since it is a calculated column, it does not have a physical existence in the underlying table and therefore cannot be updated directly. To update the value of a derived column, you would need to update the values of the underlying columns that it is based on.

Views cannot reference temporary tables. Temporary tables are created and used within a session and are not accessible outside of that session. Views, on the other hand, are stored database objects that can be accessed by multiple sessions. Therefore, views cannot reference temporary tables.

Order by in view in SQL Server can be used with top operator only.