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CUSTOMER (Cust#, Cname, City) ORDER (Order#, Odate, Cust#, Ord_Amt)

스키마에 대한 설명을 듣고 키와 외래키를 찾는다. CUSTOMER (Cust#, Cname, City) ORDER (Order#, Odate, Cust#, Ord_Amt) ORDER_ITEM (Order#, Item#, Qty) ITEM (Item#, Unit_price) SHIPMENT (Order#, Warehouse#, Ship_date) WAREHOUSE (Warehouse#, City). COMPANY DB 에 다음 갱신을 실행하였을 경우 제약 조건위반 ?.

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CUSTOMER (Cust#, Cname, City) ORDER (Order#, Odate, Cust#, Ord_Amt)

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  1. 스키마에대한 설명을듣고 키와 외래키를 찾는다 CUSTOMER (Cust#, Cname, City) ORDER (Order#, Odate, Cust#, Ord_Amt) ORDER_ITEM (Order#, Item#, Qty) ITEM (Item#, Unit_price) SHIPMENT (Order#, Warehouse#, Ship_date) WAREHOUSE (Warehouse#, City)

  2. COMPANY DB에 다음 갱신을 실행하였을 경우 제약 조건위반? (a) Insert < 'Robert', 'F', 'Scott', '943775543', '21-JUN-42', '2365 Newcastle Rd, Bellaire, TX', M, 58000, '888665555', 1 > into EMPLOYEE. (b) Insert < 'ProductA', 4, 'Bellaire', 2 > into PROJECT. (c) Insert < 'Production', 4, '943775543', '01-OCT-88' > into DEPARTMENT. (d) Insert < '677678989', null, '40.0' > into WORKS_ON. (e) Insert < '453453453', 'John', M, '12-DEC-60', 'SPOUSE' > into DEPENDENT. (f) Delete the WORKS_ON tuples with ESSN= '333445555'. (g) Delete the EMPLOYEE tuple with SSN= '987654321'. (h) Delete the PROJECT tuple with PNAME= 'ProductX'. (i) Modify the MGRSSN and MGRSTARTDATE of the DEPARTMENT tuple with DNUMBER=5 to '123456789' and '01-OCT-88', respectively. (j) Modify the SUPERSSN attribute of the EMPLOYEE tuple with SSN= '999887777' to '943775543'. (k) Modify the HOURS attribute of the WORKS_ON tuple with ESSN= '999887777' and PNO= 10 to '5.0'.

  3. CLASS(Course#, Section#, Instructor#, Semester, Year,BuildingCode, Room#, TimePeriod, Weekdays, CreditHours) • 상식적인 가정 + 과목의 분반은 특정 요일(월)의 특정 시간(3)에만 열린다. 즉, 일주일에 한 시간대에만 강의한다. • 다음의 추가 가정에 따라 후보키를 찾으시오: • Section#는 Course#, 년도, 학기에 무관하게 unique한 경우 • Section#는 특정년도, 특정학기에개설된 Course에 따라 순번으로 부여하는 경우 • Instructor는 한 학기에 한 과목만 강의할 수 있는 경우 • 위의 테이블에서 중복된 정보가 있는가? • 분반이 일주일에 여러 번 열린다면 무엇이 문제인가? 후보키는? DB 설계는?

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