SQL Server Schema Binding Views

In SQL Server, views are not bound to the schema of the base tables by default. In such case we may change the schema of the base table at any time, regardless of the fact that the associated view may or may not work with the new schema. We can even drop the underlying table while keeping the associated view without any warning. In this case when the view is used, we will get an invalid object name error for the base table.

So if you want to create an index on a view or you want to preserve the base table schema once a view has been defined, in both these cases you have to use the "WITH SCHEMABINDING" clause to bind the view to the schema of the base tables.

Read further:

http://www.mssqltips.com/sqlservertip/1610/sql-server-schema-binding-and-indexed-views/