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delete *- delete instances from a class
delete instance_variable [ from from_list ] [ where qual ]
Delete removes instances which satisfy the qualification, qual , from the class specified by instance_variable . Instance_variable is either a class name or a variable assigned by from_list . If the qualification is absent, the effect is to delete all instances in the class. The result is a valid, but empty class.
/* Remove all employees who make over $30,000 */ delete emp where emp.sal > 30000
/* Clear the hobbies class */ delete hobbies
destroy(commands).