Q1- Build a Global Conceptual Schema (GCS) from the following given local conceptual schemas (problem 7.4)

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Problem 7.4 (*) Consider the two databases given in Figs. 7.17 and 7.18 and described below. Design a global conceptual schema as a union of the two databases by first translating them into Relational database Figure 7.17 describes a relational race database used by organizers of road races and Fig. 7.18 describes an entity-relationship database used by a shoe manufacturer. The semantics of each of these database schemas is discussed below. Figure 7.17 describes a relational road race database with the following semantics: DIRECTOR is a relation that defines race directors who organize races; we assume that each race director has a unique name (to be used as the key), a phone number, and an address. DIRECTOR (NAME, PHONE_NO, ADDRESS) LICENSES(LIC_NO, CITY, DATE, ISSUES, COST, DEPT, CONTACT) RACER (NAME, ADDRESS, MEM_NUM) SPONSOR(SP_NAME, CONTACT) RACE(R_NO, LIC_NO, DIR, MAL_WIN, FRM_WIN, SP_NAME) Fig. 7.17 Road race database LICENSES is required because all races require a govemmental license, which is issued by a CONTACT in a department who is the ISSUER, possibly contained within another govemment department DEPT'; each license has a unique LIC_NO (the key), which is issued for use in a specific CITY on a specific DATE with a certain COST. RACER is a relation that describes people who participate in a race. Each person is identified by NAME, which is not sufficient to identify them uniquely, so a compound key formed with the ADDRBSS is required. Finally, each racer may have a MEM_NUM to identify him or her as a member of the racing fraternity, but not all competitors have membership numbers. SPONSOR indicates which sponsor is funding a given race. Typically, one sponsor funds a number of races through a specific person (CONTACT), and a number of races may have different sponsors. RACE uniquely identifies a single race which has a license number (LIC_NO) and race number (R._NO) (to be used as a key, since a race may be planned without acquiring a license yet); each race has a winner in the male and female groups (MAL_WIN and FEM_WIN) and a race director (DIR). Figure 7.18 illustrates an entity-relationship schema used by the sponsor's database system with the following semantics: M. Tamer zsu Patrick Valduriez Principles of Distributed Database Systems