Consider a table hierarchy with supertable STUDENT and subtables BACHELOR_STUDENT, MASTER_STUDENT and PHD_STUDENT. Both bachelor and master

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Consider a table hierarchy with supertable STUDENT and subtables BACHELOR_STUDENT, MASTER_STUDENT and PHD_STUDENT. Both bachelor and master students pass when they achieve at least 50%. PhD students pass when they achieve at least 70%. Illustrate using an SQL query how polymorphism can be useful.

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