[해법]데이터베이스 시스템 5판 해법 Ramez Elmasri
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1.11 Give some additional views that may be needed by other user groups for the
Answer:
record with StudentNumber=8 is stored in the database of Figure 1.5(a), the DBMS will
출판사 & 저자 : Ramez Elmasri
(e) (Update) Change the grade that Smith received in Intro to Computer Science section
(c) Each PREREQUISITE record relates two COURSE records: one in the role of a course
1.8 Give some informal queries and update operations that you would expect to apply to the
설명
Answer:
database. For example, in Figure 1.5(a) the fact that the name of the student with
(a) Each SECTION record is related to a COURSE record.
and the other in the role of a prerequisite to that course.
have uncontrolled redundancy.
데이터베이스,솔루션,시스템,5판
Answers to Selected Exercises
CHAPTER 1: DATABASES AND DATABASE USERS
DBMS ensures that multiple copies of the same data are consistent; for example, if a new
ensure that StudentName=Smith in that record. If the DBMS has no control over this, we
record.
(a) A view that groups all the students who took each section and gives each students
다.
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(a) (Query) List the names of all students majoring in Computer Science.
Answer:
참고 :
Redundancy is when the same fact is stored multiple times in several places in a
StudentNumber=23, Class=1 (freshman), and Major=MATH.
1.10 Name all the relationships among the records of the database shown in Figure 1.2.
database shown in Figure 1.2.
StudentNumber=8 is Brown is stored multiple times. Redundancy is controlled when the
1.9 What is the difference between controlled and uncontrolled redundancy?
database shown in Figure 1.2.
(b) (Query) What are the prerequisites of the Database course?.
(b) Each GRADE_REPORT record is related to one STUDENT record and one SECTION
completed.
SectionIdentifier, Semester, Year, Grade> for each course section that Smith has
(d) (Update) Insert a new student in the database whose Name=Jackson,
[해법]데이터베이스 시스템 5판 해법 Ramez Elmasri
Answer:
레포트 > 공학,기술계열
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(c) (Query) Retrieve the transcript of Smith. This is a list of 순서
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