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  • 数据库练习题26-45题

     1 --26、  查询存在有85分以上成绩的课程Cno.
     2 select distinct Cno from Score where Degree >85
     3 
     4 --27、查询出“计算机系“教师所教课程的成绩表。
     5 select * from Score where Cno in ( select Cno from Course where Tno in ( select Tno from Teacher where Depart = '计算机系'))
     6 
     7 
     8 --0028、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
     9 select Tname,Prof from Teacher t1 where Depart = '计算机系' and not exists (select * from Teacher t2 where Depart = '电子工程系' and t1.Prof = t2.prof)
    10 union
    11 select Tname,Prof from Teacher t1 where Depart = '电子工程系' and not exists (select * from Teacher t2 where Depart = '计算机系' and t1.Prof = t2.prof)
    12 
    13 --0029、查询选修编号为“3-105“课程且成绩至少高于一个选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。--any 任何一个值 , all 所有的数值
    14 select * from Score where Degree >any( select Degree from Score where Cno='3-245') and Cno ='3-105'  order by  Degree desc
    15 
    16 --30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.
    17 select * from Score where Degree > all(select Degree from Score where Cno='3-245') and Cno='3-105' 
    18 
    19 --31、 查询所有教师和同学的name、sex和birthday.
    20     select Sname,Ssex,Sbirthday from Student
    21 union
    22     select Tname,Tsex,Tbirthday from Teacher
    23 
    24 --32、查询所有“女”教师和“女”同学的name、sex和birthday.
    25     select Sname,Ssex,Sbirthday from Student where Ssex=''
    26 union
    27     select Tname,Tsex,Tbirthday from Teacher where Tsex=''
    28 
    29 --33、 查询成绩比该课程平均成绩低的同学的成绩表。
    30     select * from Score s1 where Degree<(select AVG(degree) from Score s2 group by Cno having s1.Cno= s2.Cno)
    31 
    32 --34、 查询所有任课教师的Tname和Depart.
    33     select Tname,Depart from Teacher where Tno in ( select Tno from Course where Cno in (select Cno from Score))
    34 
    35 --35 、 查询所有未讲课的教师的Tname和Depart. 
    36     select Tname,Depart from Teacher where Tno not in ( select Tno from Course where Cno in (select Cno from Score))
    37 
    38 --36、查询至少有2名男生的班号。--先选出所有男生,再按班级分组
    39     select Class from Student where Ssex='' group by Class having COUNT(*)>1
    40 
    41 --37、查询Student表中不姓“王”的同学记录。  
    42     select * from Student where Sname not like '王%'
    43 
    44 --0038、查询Student表中每个学生的姓名和年龄。
    45      --注:year(getdate())获取当前时间“年” getdate()获取
    46     select Sname,year(getdate())-YEAR(Sbirthday) as age from Student 
    47 
    48 --39、查询Student表中最大和最小的Sbirthday日期值。
    49      select MAX(Sbirthday),MIN(Sbirthday) from Student
    50 
    51 --40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
    52     select  *  from Student  order by Class desc,Sbirthday asc
    53  
    54 --41、查询“男”教师及其所上的课程。
    55     select Cname,Tname from Course join Teacher on Course.Tno=Teacher.Tno where Tsex='' --联合2个表格做法
    56     
    57 select * from course where tno in(select tno from teacher where tsex='')    --where做法
    58 
    59 --42、查询最高分同学的Sno、Cno和Degree列。
    60     select Sno,Cno,Degree from Score where Degree =( select MAX(Degree) from Score )--方法一
    61 
    62     select top 1 * from score order by degree desc     --方法二
    63 
    64 --43、查询和“李军”同性别的所有同学的Sname.
    65     select Sname from Student where Ssex=( select Ssex from Student  where Sname='李军') and Sname !='李军'
    66 
    67 --44、查询和“李军”同性别并同班的同学Sname.
    68     select Sname from Student where Ssex=( select Ssex from Student  where Sname='李军') and Class=(select Class from Student where Sname='李军') and Sname !='李军' --方法一
    69 
    70 select sname from student s1 where ssex=(
    71 select ssex from student s2 where sname='李军' and s1.class= s2.class
    72 )--方法二    
    73 
    74 --45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
    75     select * from Score where Cno=( select Cno from Course where Cname='计算机导论') and Sno in (select Sno from Student where Ssex='')--f方法1
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  • 原文地址:https://www.cnblogs.com/franky2015/p/4665563.html
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