ER & EER to Relational Mapping
relationship into a relational schema you must use one of the four options available. Let C be the super-class, K its primary key and A. 1, A. 2, …, A. n. its remaining attributes and let S. 1, S. 2, …, S. m. be the sub-classes. Chapter 9 11. Option 8A (multiple relation option):
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ER & EER to Relational Mapping
tinman.cs.gsu.edurelational database schema; the primary keys are underlined. DEPT_LOCATIONS. DNUMBER DLOCATION. Chapter 9 8. Step 7: For each . n-ary relationship type R, n>2 • Create a new relation S to represent R. • Include as foreign key attributes in the S the primary keys of the relations that represent
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www.csee.umbc.edurepresent such relationship sets in the relational model. Answer: Suppose the primary key of relation schema is 1 2 n and the primary key of relation schema is 1 2 m.Thenare-lationship between the 2 sets can be represented as a tuple ( 1 2 n 1 2 m). In a one-to-one relationship, each value on 1 2 n