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  • 数据库4m10d作业

    Create table student (
    Sno char(15) primary key ,
    Sname varchar(10) not null,
    Sage tinyint ,
    Special varchar(20),
    Birth date,
    Sex char(2)
    );

    insert into stu(sno,sname,sage,special,birth,sex) values
    ('st002','lisi',19,'CS','1999-1-2','M'),
    ('st003','wangwu',20,'CS','1998-1-2','M'),
    ('st004','zhaoliu',21,'art','1997-1-2','M'),
    ('st005','sunqi',22,'math','1996-1-2','F'),
    ('st006','lisi',35,'en','1983-1-2','F'),
    ('st007','jia',18,'CS','2000-1-2','M'),
    ('st008','peter',16,'edu','2002-1-2','F'),
    ('st009','hanmeimei',19,'art','1999-1-2','F'),
    ('st0010','poly',8,'CS','2008-1-2','F'),
    ('st0011','zhangliu',21,'art','1997-7-2','M'),
    ('st0012','wangliu',27,'art','1991-1-2','M'),
    ('st0013','liliu',26,'art','1992-1-2','F'),
    ('st0014','sunliu',20,'art','1998-1-2','F'),
    ('st0015','lisi',18,'CS','2000-1-2','F'),
    ('st0016','wangwu',20,'CS','1998-1-2','F'),
    ('st0017','lisi',17,'CS','2001-1-2','M'),
    ('st0018','wangwu',26,'CS','1992-1-2','M');
    课前复习:
    1查询表中学生的学号,姓名,年龄信息。
    select sno,sname,sage from student;
    2查询edu系所有女生的信息。
    select * from student where Special ='edu' and Sex ='f';
    3查询所有在1999年以后出生的学生的所有信息。
    select * from student where birth>'1999-1-1';
    select * from student where year(birth)>1999;
    4.查询所有在2000年至2010年出生的所有学生的信息。
    select * from student where Birth between '2000-1-1' and '2010-12-31';
    select * from student where Birth>='2000-1-1' and Birth <='2010-12-31';
    作业:
    1.查询所有学生的最大,最小,平均年龄。
    2.查询art系学生的最大,最小,平均年龄,。
    3.查询各个系学生的最大,最小,平均年龄。
    4.查询人数超过5的专业名称及人数。
    5.按年龄从小到大查询所有人的信息。
    6.按年龄从大到小查询所有人的信息。
    7.按学号递减,年龄递增查询所有人的信息。

    Create table student1 (
    Sno char(15) primary key ,
    Sname varchar(10) not null,
    Sage tinyint ,
    Special varchar(20),
    Birth date,
    Sex char(2)
    );
    select * from student1
    insert into student1(sno,sname,sage,special,birth,sex) values
    ('st002','lisi',19,'CS','1999-1-2','M'),
    ('st003','wangwu',20,'CS','1998-1-2','M'),
    ('st004','zhaoliu',21,'art','1997-1-2','M'),
    ('st005','sunqi',22,'math','1996-1-2','F'),
    ('st006','lisi',35,'en','1983-1-2','F'),
    ('st007','jia',18,'CS','2000-1-2','M'),
    ('st008','peter',16,'edu','2002-1-2','F'),
    ('st009','hanmeimei',19,'art','1999-1-2','F'),
    ('st010','poly',8,'CS','2008-1-2','F'),
    ('st011','zhangliu',21,'art','1997-7-2','M'),
    ('st012','wangliu',27,'art','1991-1-2','M'),
    ('st013','liliu',26,'art','1992-1-2','F'),
    ('st014','sunliu',20,'art','1998-1-2','F'),
    ('st015','lisi',18,'CS','2000-1-2','F'),
    ('st016','wangwu',20,'CS','1998-1-2','F'),
    ('st017','lisi',17,'CS','2001-1-2','M'),
    ('st018','wangwu',26,'CS','1992-1-2','M');

    /1.查询所有学生的最大,最小,平均年龄/
    select AVG(sage) as AVG, MAX(sage) as MAX,MIN(sage) as MIN from student1;
    /2. 查询art系学生的最大,最小,平均年龄/
    select MAX(sage) as MAXage,MIN(sage) as MINage,AVG(sage) as AVGage from student1 where Special='art';
    /* 3.查询各个系学生的最大,最小,平均年龄。 /
    select MAX(sage) as MAXage,MIN(sage) as MINage,AVG(sage) as AVGage from student1 group by Special ;
    /
    4.查询人数超过5的专业名称及人数。/
    select Special ,count(
    ) as [专业人数]from student1 group by Special HAVING COUNT() > 5;
    /
    5.按年龄从小到大查询所有人的信息。/
    select sno,sname,sage,special,birth,sex from student1 order by sage asc;
    /
    6.按年龄从大到小查询所有人的信息。 /
    select sno,sname,sage,special,birth,sex from student1 order by sage desc;
    /
    7.按学号递减,年龄递增查询所有人的信息。/
    select sno,sname,sage,special,birth,sex from student1 order by sno desc ,Sage asc;
    /
    表名自行修改为了student1,学号应该是三位 将原数据 如st0018改为st018否则按原来的学号无法递减排序*/

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  • 原文地址:https://www.cnblogs.com/whatiwhere/p/8784423.html
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