WITH CHECK OPTION on a view

WITH CHECK OPTION is an optional clause on the CREATE VIEW statement. It specifies the level of checking when data is inserted or updated through a view.

If WITH CHECK OPTION is specified, every row that is inserted or updated through the view must conform to the definition of the view. The option cannot be specified if the view is read-only. The definition of the view must not include a subquery.

If the view is created without a WITH CHECK OPTION clause, insert and update operations that are performed on the view are not checked for conformance to the view definition. Some checking might still occur if the view is directly or indirectly dependent on another view that includes WITH CHECK OPTION. Because the definition of the view is not used, rows that do not conform to the definition of the view might be inserted or updated through the view. This means that the rows cannot be selected again through the view.