Question

As the question title, is there a way to do this?

eg:

DrivingLicence
--------------- 
CanDriveCar       (bool) 
CanDriveMotorbike (bool) 
CanDriveBus       (bool)

You can’t drive a bus without a car licence, so I want the DB to throw an exception if anyone tries to give someone a bus licence when they haven’t a car licence.

Answer 1

ALTER TABLE dbo.DrivingLicence ADD CONSTRAINT
    NameOfConstraint CHECK (CanDriveBus=0 OR CanDriveCar=1)