Database Quizz I Write down your answers in word document with file name highlighting your name, student number, and class. E.g “95002”+”_”+ “03 class”+”_”+”name”, like, “95002_03_Mike.doc”

Number 1（20%） Use one SQL statement to get the list of all the student names, whose every registered course has a score higher than 85. name　 course　 score Mike 　DataBase　　 81 Jane　 DataBase　　 86 Jane　　Math　　　 90 Tonny　DataBase 　　86 Tonny　 Math　　 100   A. select distinct name from SC　 where　name not in (select distinct name from SC where score<=85)

Number 2 （20%） Assume the student table has the following rows. Serial Number Sno Sname Cno Cname Score 1　　　　 2005001　Mike　0001　　　Math　　99 2　　　　 2005002　John　0001　　　Math　　89 3　　　　 2005001　Mike 0001　　　Math　　99 Use one SQL statement to delete the records whose attributes are redundant except for Serial number. A. delete from tablename where seriel Number not in (select min(serial Number) from tablename group by Sno, Sname, Cname, Score)

Number 3（30%） Assume a database has the following tables. Teacher(Tno, Tname) describes the information concerning teachers Student(Sno,Sname,Sage,Ssex) stores the information about students Course(Cno,Cname,Tno) is the course table SC(Sno,Cno,score) has the scores 1. Use one SQL statement to get the list of student names, who at least registers one common course with student with Sno “95005” A. select distinct SC.Sno,Sname from Student,SC where Student.Sno=SC.Sno and Cno in (select Cno from SC where Sno=‘95005') 2. Use one SQL statement to get the complete list of students, who registers only one course. Print their student numbers and names and order the list by student number. A. select SC.Sno,Student.Sname,count(Cno) from SC ,Student where SC.Sno=Student.Sno group by SC.Sno ,Student.Sname having count(Cno)=1  

3. Use one SQL statement to get the list of courses, each of which is registered by every student.   A. select　Cno, Cname　 from　Course　 where　Cno　in　 (select　Cno from　SC group　by　Cno having count(*) = (select count(*) from student))