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Joe Celko tackles an introduction to the subject, but there is something about the topic that makes it likely that even the experienced developer will find out something new from reading it.

Yes, a view is a SELECT query against underlying tables/views.

If you modify data in the underlying table(s), and if that range is included in the view definition then you will see the modified data.

SQL Views are essential for the database developer.

However, it is common to see them misued, or neglected.

Just adding on to @Curt's Answer, if the update you made to underlying tables is adding or deleting Data, then the view is auto updated with the new data.