Give examples of binary 1:N relationships, other than those in this text, for (a) an optional-to-optional relationship,
Question:
Give examples of binary 1:N relationships, other than those in this text, for
(a) an optional-to-optional relationship,
(b) an optional-to-mandatory relationship,
(c) a mandatory-to-optional relationship, and
(d) a mandatory-to-mandatory relation- ship. Illustrate your answer by using IE Crow's Foot E-R diagrams.
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