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Updatable Views
As mentioned earlier, there are a number of factors that affect whether a view without an INSTEAD OF trigger is updatable. Because you control how updates occur with views that have INSTEAD OF triggers, these restrictions don't apply to them. Otherwise, for a view to allow updates, the following criteria must be met:
Aggregate functions, the TOP, GROUP BY, UNION, or DISTINCT clauses/keywords, are not allowed.
Derived columns (columns constructed from complex expressions) cannot be updated.
SELECT lists consisting entirely of nontabular expressions are not allowed.
Again, the bottom line is that the server must be able to translate an update to a row in the view into an update to a row in a base table. If it can't do this, you can't update the view.
