Views are stored queries that can be queried like regular tables. Views are not part of the physical model of the database. Any changes that are applied to the data source of a view, such as a table, will be reflected in the view as well.
CREATE VIEW dbo.PersonsView AS SELECT name, address FROM persons;
This query will drop the view - if it already exists - and create a new one.
IF OBJECT_ID('dbo.PersonsView', 'V') IS NOT NULL DROP VIEW dbo.PersonsView GO CREATE VIEW dbo.PersonsView AS SELECT name, address FROM persons;
If a view is created WITH SCHEMABINDING, the underlying table(s) can't be dropped or modified in such a way that they would break the view. For example, a table column referenced in a view can't be removed.
CREATE VIEW dbo.PersonsView WITH SCHEMABINDING AS SELECT name, address FROM dbo.PERSONS -- database schema must be specified when WITH SCHEMABINDING is present
Views without schema binding can break if their underlying table(s) change or get dropped. Querying a broken view results in an error message. sp_refreshview can be used to ensure existing views without schema binding aren't broken.