diff --git "a/57 \351\273\204\346\265\201\346\266\233/20230309 \345\244\247\344\275\234\344\270\232.md" "b/57 \351\273\204\346\265\201\346\266\233/20230309 \345\244\247\344\275\234\344\270\232.md" new file mode 100644 index 0000000000000000000000000000000000000000..30cf3bd52d5bf0ad9358c462fa16eb7bfcdee558 --- /dev/null +++ "b/57 \351\273\204\346\265\201\346\266\233/20230309 \345\244\247\344\275\234\344\270\232.md" @@ -0,0 +1,106 @@ +# 大作业 + + + +```mysql +create database xiaoshuo charset utf8; +use xiaoshuo; +create table author ( +author_id int primary key, +author_name varchar(20) not null unique key, +credits int, +vip_id varchar(20), +foreign key (vip_id) references vip(vip_id) +); +create table vip( +vip_id varchar(20) primary key, +vip_name varchar(20) not null unique key +); +create table story( + story_id int primary key auto_increment comment '作品编号', + author_id int comment '作家编号', + type_id varchar(20) comment '类型编号', + story_name varchar(50) comment '作品名称', + views_number int comment'浏览器', + foreign key (author_id) references author(author_id), + foreign key (type_id) references type(type_id) +); +create table type( + type_id varchar(20) primary key comment '类型编号', + type_name varchar(20) not null unique key comment '类型名称' +); +insert into author values +(1001,'朱逸群',600,'VIP02'), +(1002,'范建',8510,'VIP04'), +(1003,'史珍香',981,'VIP02'), +(1004,'范统',2364,'VIP02'), +(1005,'杜子腾',257,'VIP01'), +(1006,'刘产',678,'VIP02'), +(1007,'杜琦燕',438,'VIP03'); +insert into vip VALUES +('VIP01','青铜作家'), +('VIP02','白银作家'), +('VIP03','黄金作家'), +('VIP04','钻石作家'); +insert into story values +(1,1002,'L03','母猪产后与护理师的二三事',6541), +(2,1005,'L04','拖拉机大战蜘蛛侠',563), +(3,1003,'L01','这只小龙虾不正经',8754), +(4,1006,'L04','一个爹爹三个娃',36354), +(5,1006,'L01','皇上滚开本宫只劫财',3674), +(6,1005,'L05','给长城贴瓷砖的小太监',6541), +(7,1003,'L03','不科学御兽',1257), +(8,1005,'L01','镜面管理局',3216), +(9,1004,'L02','关于我成为灭魂师之后',1147), +(10,1004,'L05','公子别秀',2078); +insert into type values +('L01','玄幻'), +('L02','奇幻'), +('L03','武侠'), +('L04','仙侠'), +('L05','都市'); +-- 2. 将story 表中的story_name字段类型改成varchar(40) 。(2分) +alter table story modify story_name varchar(40); +-- 3. 在author表中增加一个性别字段 字段名:author_sex,类型: char(10),要求默认值为'男'。 (3分) +alter table author add author_sex char(10) default '男'; +-- 4. 将作家编号为1005、1007的作家性别改为'女' 。(2分) +select * from author; +update author set author_sex='女' where author_id=1005 or author_id=1007; +-- 5. 作家杜子腾,写了一篇名为《拜登夸我很帅》的都市小说,有854个浏览量,请将这条信息插入到story +-- 表。(3分) +select * from story; +insert into story values (null,1005,'L05','拜登夸我很帅',854); +-- 6. 《拖拉机大战蜘蛛侠》这篇小说,浏览量涨了100,请更新story表中的相关数据。(2分) +update story set views_number=views_number+100 where story_name='拖拉机大战蜘蛛侠'; +-- 7. 请删除story表的中《皇上滚开本宫只劫财》这篇小说相关数据。(2分) +delete from story where story_name='皇上滚开本宫只劫财'; +-- 8. 查询 浏览量大于 8000的小说的作者编号和小说作品名称。(2分) +select * from story where views_number>8000; +-- 9. 查询积分大于1000 并且会员等级高于vip03的作家所有信息。(3分) +select * from author where credits>1000 and vip_id>'vip03'; +-- 10. 查询姓名以杜字开头的作家的姓名,积分和等级编号。(3分) +select * from author where author_name like '杜%'; +-- 11. 查询积分在100、1000之间的作家信息,以积分降序排列。 (3分) +select * from author where credits > 100 and credits < 1000 order by credits desc; +-- 12. 查询出小说的总浏览量,最高浏览量,最小浏览量,平均浏览量,给字段用上中文别名。(3分) +select sum(views_number) 总浏览量,max(views_number) 最高浏览量,min(views_number) 最小浏览量,avg(views_number) 平均浏览量 from story; +-- 13. 查询各种等级的作家的平均积分和作家数量,并对查询结果使用中文别名。(3分) +select round(avg(credits),2) 平均积分,count(vip_id) 作家数量 from author group by vip_id; +-- 14. 查询小说数量大于等于2的分类编号和小说数量。(4分) +select author_id,count(author_id) a from story group by author_id having a>=2; +-- 15. 查询所有小说中浏览量最少的书的作品编号、作品名称和类型编号、浏览量。(4分) +select story_id,story_name,type_id,views_number from story where views_number=(select min(views_number) from story); +-- 16. 查询积分比刘产高的作者所有信息。(5分) +select * from author where credits>(select credits from author where author_name='刘产'); +-- 17. 查询出哪些白银作家是没有写小说的,显示这些作家的姓名、等级名称。(8分) +select author_name,vip_id from story a right join (select * from author where vip_id=(select vip_id from vip where vip_name='白银作家')) b on a.author_id=b.author_id where story_name is null; +-- 18. 找出写过作品浏览量大于5000的作家的所有作品中浏览量不到1000的作品信息(8分) +select author_id from story where views_number>5000; +select * from story where author_id = any(select author_id from story where views_number>5000) and views_number <1000; +-- 19. 查询所有小说的小说编号、小说名称、浏览量、分类名称、作者姓名、作者积分、作者等级名称,结果 +-- 字段要用中文别名,并按浏览量降序排列,如果浏览量一样的,再按积分降序排列。(10分) +select story_id 小说编号,story_name 小说名称,views_number 浏览量,type_name 分类名称,author_name 作者姓名,credits 作者积分,vip_name 作者等级名称 from vip e right join +(select story_id,story_name,views_number,type_name,author_name,credits,vip_id from author c right join +(select story_id,story_name,views_number,type_name,author_id from story a left join type b on a.type_id=b.type_id) d on c.author_id=d.author_id) f on e.vip_id=f.vip_id order by 浏览量,作者积分; +``` + diff --git "a/57 \351\273\204\346\265\201\346\266\233/20230312 \344\275\234\344\270\232.md" "b/57 \351\273\204\346\265\201\346\266\233/20230312 \344\275\234\344\270\232.md" new file mode 100644 index 0000000000000000000000000000000000000000..769bc49102a0b7d0ba3ee899c7b4861701b6f3bb --- /dev/null +++ "b/57 \351\273\204\346\265\201\346\266\233/20230312 \344\275\234\344\270\232.md" @@ -0,0 +1,114 @@ +# 作业 + + + +```mysql +create database 57h charset utf8; +use 57h; +create table stuinfo( +stuno varchar(10) primary key, +stuname varchar(10), +stuage int, +stuaddress varchar(10), +stuseat int, +stusex char +); +create table stuexam( +examno int, +stuno varchar(10), +writtenexam int, +labexam int, +foreign key (stuno) references stuinfo(stuno) +); +insert into stuinfo values +('s2501','张秋利',20,'美国硅谷',1,'1'), +('s2502','李斯文',18,'湖北武汉',2,'0'), +('s2503','马文才',22,'湖南长沙',3,'1'), +('s2504','欧阳俊雄',21,'湖北武汉',4,'0'), +('s2505','梅超风',20,'湖北武汉',5,'1'), +('s2506','陈旋风',19,'美国硅谷',6,'1'), +('s2507','陈凤',20,'美国硅谷',7,'0'); +insert into stuexam values +(1,'s2501',50,70), +(2,'s2502',60,65), +(3,'s2503',86,85), +(4,'s2504',40,80), +(5,'s2505',70,90), +(6,'s2506',85,90); + +-- 1.查询学生信息表(stuinfo)中所有列信息,给每列取上中文名称 +select stuno 学号,stuname 姓名,stuage 年龄,stuaddress 地址,stuseat 编号,stusex 性别 from stuinfo; +-- +-- 2.查询学生信息表(stuinfo)中的姓名,年龄和地址三列的信息 +select stuname,stuage,stuaddress from stuinfo; +-- +-- 3.查询学生分数表(stuexam)中的学号,笔试和机试三列的信息,并为这三列取中文名字 +select stuno 学号,writtenexam 笔试,labexam 机试 from stuexam; +-- +-- 5.查询学生分数表(stuexam)中的学生的学号,笔试,机试以及总分这四列的信息 +select stuno 学号,writtenexam 笔试,labexam 机试,(writtenexam+labexam) 总分 from stuexam; +-- +-- 6.查询学生信息表(stuInfo)中学生来自哪几个地方 +select stuname,stuaddress from stuinfo; +-- +-- 7.查询学生信息表(stuInfo)中学生有哪几种年龄,并为该列取对应的中文列名 + +-- +-- 8.查询学生信息表(stuInfo)中前3行记录 +select * from stuinfo where stuseat < 4; +-- +-- 9.查询学生信息表(stuInfo)中前4个学生的姓名和座位号 +select stuname,stuseat from stuinfo where stuseat < 5; +-- +-- 11.将地址是湖北武汉,年龄是20的学生的所有信息查询出来 +select * from stuinfo where stuaddress = '湖北武汉' and stuage = 20; +-- +-- 12.将机试成绩在60-80之间的信息查询出来,并按照机试成绩降序排列 +select * from stuexam where labexam between 60 and 80 order by labexam desc; +-- +-- 13.查询来自湖北武汉或者湖南长沙的学生的所有信息 +select * from stuinfo where stuaddress = '湖北武汉' or stuaddress = '湖南长沙'; +-- +-- 14.查询出笔试成绩不在70-90之间的信息,并按照笔试成绩升序排列 +select * from stuexam where writtenexam not between 70 and 90 order by writtenexam asc; +-- +-- 15.查询年龄没有写的学生所有信息 +select * from stuinfo where stuage is null; +-- +-- 16.查询年龄写了的学生所有信息 +select * from stuinfo where stuage is not null; +-- +-- 17.查询姓张的学生信息 +select * from stuinfo where stuname like '张%'; +-- +-- 18.查询学生地址中有‘湖’字的信息 +select * from stuinfo where stuaddress like '%湖%'; +-- +-- 19.查询姓张但名为一个字的学生信息 +select * from stuinfo where stuname like '张_'; +-- +-- 20.查询姓名中第三个字为‘俊’的学生的信息,‘俊’后面有多少个字不限制 +select * from stuinfo where stuname like '__俊%'; +-- +-- 21.按学生的年龄降序显示所有学生信息 +select * from stuinfo order by stuage desc; +-- +-- 22.按学生的年龄降序和座位号升序来显示所有学生的信息 +select * from stuinfo order by stuage,stuseat; +-- +-- 23显示笔试第一名的学生的考试号,学号,笔试成绩和机试成绩 +select * from stuexam where writtenExam=(select max(writtenExam) from stuexam); +-- +-- 24.显示机试倒数第一名的学生的考试号,学号,笔试成绩和机试成绩 +select * from stuexam where labexam=(select min(labExam) from stuexam); +-- +-- 25.查询每个地方的学生的平均年龄 +select round(avg(stuage),1) from stuinfo group by stuaddress; +-- +-- 26.查询男女生的分别的年龄总和 +select stusex,sum(stuage) from stuinfo group by stusex; +-- +-- 27.查询每个地方的男女生的平均年龄和年龄的总和 +select stuaddress,stusex,round(avg(stuage),1) from stuinfo group by stuaddress,stusex; +``` +