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What is a disjoint less constraint?
Ans: It needs that an entity belongs to no much more than one level entity set.
Disjoint less constraint needs that an entity belongs to no more than one level entity set. (the meaning of Disjoint less constraint is that an entity can be a member of at most one of the subclasses of the specialization.)
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FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
growing phase and shrinking phase are disjoint, why ?
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