2023年数据库实验报告4

实验内容与规定请有选择地实践以下各题。(1)基于“教学管理”数据库jxgl,使用SQL的查询语句表达下列查询：①检索年龄大于23岁的男学生的学号和姓名；SELECTSno,SnameFROMStudentWHERESsex=,男'ANDSage>23;②检索至少选修一门课程的女生姓名；SELECTSnameFROMStudentWHERESsex='女'ANDSnoIN(SELECTSnoFROMSCGROUPBYSnoHAVINGcount(*)>=1;)；③检索王同学不学的课程的课程号；SELECTCno;FROMCourseWHERECnoNOTIN(SELECTCnoFROMStudent,SCWHERESnamelike'王％'ANDStudent.Sno=SC.Sno)；④检索至少选修两门课程的学生学号;WHERETEACHER.TNO=COURSE.TNOANDSC.C0N=COURSE.C0NGROUPBYSC.CNOHAVINGcount(SNO)>20；11查询选修编号为“8105”课程且成绩至少高于其选修编号为“8245”课程成绩的同学的SNO及“8105”课程成绩,并按成绩从高到低依次排列；SELECTSNOGRADEFROMSCXWHERECN0=,8105'ANDGRADE>(SELECTGRADEFROMSCYWHERECNO=*8245'ANDX.SNO=Y.SNO)ORDERBYGRADEDESC；12查询选修编号为“8105”课程且成绩高于所有选修编号为“8245”课程成绩的同学的CNO、SNO、GRADE；SELECTCNO,SNO,GRADEFROMSCWHERECNO'8105'ANDGRADE>(SELECTMAX(GRADE)FROMSCWHERECNO='8245'ANDX.CN0=Y.SNO)；13列出所有教师和同学的姓名，SEX,AGE；SELECTTNAME,TEACHER.SEX.TI:ACHER.AGE,SNAME,STUDENT.SEX,STUDENT.AGFROMTEACHER,SC14查询成绩比该课程平均成绩高的学生的成绩表;SELECT*FROMSC.XGROUPBYSNOHAVINGGRADE)(0SELECTAVG(GRADE)FROMSC.YWHEREX.CN0=Y.CNOGROUPBYCNO)；15列出所有任课教师的TNAME和DEPT；SELECTTNAME,DEPTFROMTEACHER,COURSEWHERETEACHER.TNO=COURSE.TNO16列出所有未讲课教师的TNAUE和DEPT;SELECTTNAME,DEPYFROMTEACHERWHERENOTEXISTS(SELECT大FROMCOURSEWHERETEACHER.TNOCOURSE.TNO);17列出至少有4名男生的班号；SELECTCLASSFROMSTUDENTGROUPBYCLASSHAVINGcount(SNO)>=4;18查询不姓“张”的学生记录；SELECT*FROMSTUDENTWHERESNAMENOTLIKE'张％’;9查询每门课最高分的学生的SNO,CNO,GRADE；SELECTSNO,CNO,GRADEFROMSCGROUPBYCNOHAVINGGRADE=MAX(GRADE);0查询与“李华”同性并同班的同学SNAME;SELECTSNAMEFROMSTUDENTXWHERECLASS=(SELECTCLASSFROMSTUDENTYWHERESNAME=>李华'ANDSEX=(SELSCTSEXFROMSTUDENTZWHERESNAME=,李华'ANDX.SNO=Y.SNOANDY.SNO=Z.SNO);21查询“女”教师及其所上的课程；SELECTTNAME,CNO,CNAMEFROMTEACHER,COURSEWHERETEACHER.TNO=COURSE.TNO,SEX=,女'；22查询选修“数据库系统”课程的“男”同学的成绩表；SELECT*FROMSC,COURSE,STUDENTWHERESTUDENT.SNO=SC.SNOANDCOURSE.CNO=SC.CNOANDCNAME=>数据库系统’ANDSEX='男'；23查询所有比刘涛年龄大的教师姓名，年龄和刘涛的年龄；SELECTTNAME,AGEFROMTEACHERXWHERESNAME=,刘涛'ORAGE>(SELECTAGEFROMTEACHERYWHEREX.TNO=Y.TNOANDSNAME:'刘涛')；24查询不讲授“8106”号课程的教师姓名。SELECTTNAMEFROMTEACHER,COURSEWHERETEACHER.NO=COURSE.TNOANDCNONOTIN(8106);SELECTDISTINCTSnoFROMSCGROUPBYSnoHAVINGcount(*)>=2;⑤检索所有学生都选修的课程的课程号与课程名；SELECTCno,CnameFROMCourseWHERENOTEXISTS(SELECT*FROMStudentWHERENOTEXISTS(SELECT*FROMSCWHERESC.Sno=Student.SnoANDSC.Cno=Course.Cno))；⑥检索选修了所有3学分课程的学生学号；SELECTDISTINCTSnoFROMSCXWHERENOTEXISTS(SELECT*FROMCourseWHERECcredit=3ANDNOTEXISTS(SELECT*FROMSCYWHEREX.Sno=Y.SnoANDCourse.Cno=Y.Cno);(2)基于“教学管理”数据库jxg1,使用SQL的查询语句表达下列查询：①记录有学生选修的课程门数；oSELECTcount(DISTINCTCno)FROMSC;②求选修4号课程的学生的平均年龄；-SELECTAVG(Sage)FROMStudent,SCWHERECno=4ANDStudent.Sno=SC.Sno;③求学分为3的每门课程的学生平均成绩；SELECTAVG(Grade)FROMCourse,SCWHERECcredit=3ANDCourse.Cno=SC.CnoGROUPBYSC.Cno;④记录每门课程的学生选修人数，规定超过3人的课程才记录，规定输出课程号和选修人数,查询结果按人数降序排列,若人数相同,按课程号升序排列；SELECTCno,count(Sno)FROMSCGROUPBYCnoHAVINGcount(Sno)>30RDERBYcount(Sno)DESC,CnoASC;⑤检索学号比“王菲”同学大而年龄比他小的学生姓名；SELECTSnameFROMStudentXWHERESno>(SELECTSnoFROMStudentYWHERESname=,王菲'ANDSage>(6ELECTSageFROMStudentZWHERESname=,王菲'ANDX.Sno=Z.SnoANDY.Sno=Z.Sno));⑥检索姓名以“王”打头的所有学生的姓名和年龄；SELECTSname,SageFROMStudentWHERESnameLIKE'王％';⑦在SC中检索成绩为空置的学生学号和课程号；SELECTSno,CnoFROMSCWHEREGradeisNULL；⑧求年龄大于女同学平均年龄的男学生姓名和年龄；SELECTSname,SageFROMStudentXWHERESsex=,男'ANDSage>(•SELECTAVG(Sage)FROMStudentWHERESsex=,女'ANDX.Sno=Y.Sno)；⑨求年龄大于所有女同学年龄的男同学姓名和年龄；SELECTSname,SageFROMStudentXWHERESsex=,男'ANDSage>(SELECTMAX(Sage)FROMStudentYWHERESsex=,女'ANDX.Sno=Y.Sno)；⑩检索所有比“王华”年龄大的学生姓名，年龄和性别；SELECTSname,Sage,SsexFROMStudentXWHERESage>(oSELECTSageFROMStudentYWHERESname='王华'ANDX.Sno=Y.Sno);①检索选修“2”课程的学生中成绩最高的学生和学号；SELECTSname,SC.SnoFR0MStudent,SCWHERECno=2ANDStudent.Sno=SC.Sno;②检索学生姓名和其所选修课程的课程号和成绩；SELECTSname,Cno,GradeFROMStudent,SCWHEREStudent.Sno=SC.SnoGROUPBYSnamc;③检索选修4门以上课程的学生总成绩(不记录不及格的课程)，并规定按总成绩的降序排列出来；SELECTSno,SUM(Grade)FROMSCXWHEREGrade>=60ANDSnoIN(oSELECTSnoFROMSCYWHEREX.Sno=Y.SnoGROUPBYSnoHAVINGcount(Cno)>4)ORDERBYSUM(Grade)DESC；(3)设有表4-1〜表4-4的4个基本表(表结构于表内容是假设的)，请先创建数据库及根据表内容创建表结构,并添加表记录，写出实现以下各题功能的SQL语句：创建以下4各表：CREATETABLESTUDENT(SNOCH/\R(6)PRIMARYKEY,SNAMECHAR(20)UNIQUE,SEXCHAR(2),AGESMALLINT,CLASSCHAR(4))；CREATETABLETEACHER(TNOCHAR(3)PRIMARYKET,TNAMWCHAR(20)UNIQUE,SEXCHAR(2),AGESMALLINT,PROFCHAR(10),DEPTCHAR(10))；CREATETABLECOURSE(CNOCHAR(4)PRIMARYKEY,CNAMECHAR(20)UNIQUE,TNOCHAT(3),FOREIGNKEYTNOREFERENCESTEACHER(TNO))；CREATETABLESC(SNOCHAR(6),CNOCHAR(4),GRADESMALLINT,PRIMARYKEY(SNO,CNO),FOREIGNKEYSNOREFERENCESSTUDENT(SNO),FOREIGNKEYCNOREFERENCESCOURSE(CNO))；插入数据：INSERTINTOSTUDENTVALUES('980101'李华'，'男'，19,'9801');同上方法依次插入数据①杳询选修课程“8105”且成绩在80到90之间的所有记录;SELECT*FROMSCWHERECN0=,8105'ANDGRADEBETWEEN80AND90;②查询成绩为79,89或99的记录；SELECT*FROMSCWHEREGRADEIN(79,89,99);③查询“9803”班的学生人数；SELECTcount(SNO)FROMSTUDENTWHERESNOLIKE'9803%';④查询至少有20名学生选修的并且课程号以8开头的课程及平均成绩;SELECTCNO,AVG(GRADE)FROMSCWHERECNOLIKE'8%'GROUPBYCNO;HAVINGcount(SNO)>=20;⑤查询最低分大于80,最高分小于95的SNO与平均分；SELECTSNO,AVG(GRADE)FROMSCGROUPBYSNOHAVINGMIN(GRADE)>80ANDMAX(GRADE)<95;⑥查询“9803”班的学