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Updating table from a view in sql

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Similar is the case with views, but complexity increases with join views.Needless to say, modifying the view is not advisable as it violates the purpose of the view.When a view is created in SQL Server, metadata for the referenced table columns (column name and ordinal position) is persisted in the database.Maria DB stores an IS_UPDATABLE flag with each view, so it is always possible to see if Maria DB considers a view updatable (although not necessarily insertable) by querying the IS_UPDATABLE column in the INFORMATION_SCHEMA. The WITH CHECK OPTION clause is used to prevent updates or inserts to views unless the WHERE clause in the SELECT statement is true. WITH LOCAL CHECK OPTION restricts the CHECK OPTION to only the view being defined, while WITH CASCADED CHECK OPTION checks all underlying views as well.See also SQL Server 2014 Modify Data Through a View.

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When ever you update the records it updates the original data since they are pointers to the original.Columns formed using the set operators UNION, UNION ALL, CROSSJOIN, EXCEPT and INTERSECT amount to a computation and are also not updatable.The SQL UPDATE VIEW command can be used to modify the data of a view. In Enterprise applications, we find that there are numerous tables and those may be normalized.So data to be inserted for a "Business Entity" may be split into various tables as part of normailzation.The complete list of restrictions are given below (reference: MSDN).