Friday, January 25, 2013

Creating Views - WITH CHECK OPTION

Something I hadn't appreciated today, the WITH CHECK OPTION when creating views.

The WITH CHECK OPTION is implemented at the end of a view definition.

CREATE VIEW redCars AS
    (
        SELECT type, model, registration, colour
    FROM Vehicles
    WHERE type = 'Car'
    AND Colour = 'Red'
    )
    WITH CHECK OPTION


It ensures changes that would alter the returned rows cannot occur.

UPDATE redCars SET Registration = 'ABC123' will therefore succeed.
UPDATE redcars SET Colour = 'Blue' will not

Links :
DevX.com - The WITH CHECK OPTION option with views
Tony Rogerson - WITH CHECK on CREATE VIEW

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