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What does it mean to say that an association is "one-to-one"? It means that it is (select one):
O Bidirectional
O Both functional and total
O Functional
O Both functional and inverse functional
A referential integrity constraint for a reference property p with domain class C and range class D has to be checked whenever (select one or many):
☐ An object of type C is destroyed.
☐ The value of p is changed for some object of type C.
☐ A new object of type C is created.
☐ An object of type D is destroyed.
☐ A new object of type D is created.
A unidirectional binary association is functional if and only if (select one):
O Each object of the source class is linked to at most one object of the target class.
O Each object of the target class is linked to at most one object of the source class.
O Each object of the source class is linked to at least one object of the target class.
O Each object of the source class is linked to exactly one object of the target class.
Assume that we have an object type B with a standard
identifier attribute id and an object type A
with an ID reference attribute b_id referencing
B::id. Further, assume that there is an object
b of type B with b.id = 11 and an
object a of type A referencing b
with a.b_id = 11. Which of the following statements are
correct? Select one or many:
☐ The object b can be destroyed when the ID
reference in object a is unassigned (by setting
a.b_id to undefined in JS or to
null in Java) and there is no other object that
references b.
☐ The object a can only be destroyed when
b has been destroyed before.
☐ The object b can be destroyed when the ID
reference in object a is reset to another object of
type B, e.g. by setting a.b_id = 7 and
there is no other object that references b.
☐ The object b can be destroyed when
a has been destroyed before.
Which of the following statements about a single-valued reference property p and how it should be rendered in a web user interface by a suitable form control are correct? Select one or many:
☐ An adequate rendering is obtained by using an
input control with type="text".
☐ If the cardinality of p's range is not greater than 7, it can be rendered by a check button group.
☐ If the cardinality of p's range is not greater than 7, it can be rendered by a radio button group.
☐ It can always be rendered by a single-select
control.