diff --git "a/22\346\226\275\346\231\237\345\256\270/20230306 \345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.sql" "b/22\346\226\275\346\231\237\345\256\270/20230306 \345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.sql" new file mode 100644 index 0000000000000000000000000000000000000000..28041730b8a6d6949eca9d6649fbff7b337ce5fc --- /dev/null +++ "b/22\346\226\275\346\231\237\345\256\270/20230306 \345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.sql" @@ -0,0 +1,129 @@ +create database cxw charset utf8; +use cxw; +create table stuinfo( + stuNO varchar(10) primary key, + stuName varchar(10)not null, + stuSex enum('男','女')not null, + stuAge varchar(10)not null, + stuAddress varchar(20)not null, + stuSeat int +); + +create table stuExam( + examNO int, + stuNO varchar(10), + writtenExam varchar(3)not null, + labExam varchar(3)not null, + foreign key(examNO) references stuMarks(examNO), + foreign key(stuNO) references stuinfo(stuNO) +); + +create table stuMarks( + examNO int primary key, + stuID varchar(10)not null, + score varchar(10)not null +); + +insert into stuinfo values('s2501','张秋利','男','20','美国硅谷','1'); +insert into stuinfo values('s2502','李斯文','女','18','湖北武汉','2'); +insert into stuinfo values('s2503','马文才','男','18','湖南长沙','3'); +insert into stuinfo values('s2504','欧阳俊雄','女','21','湖北武汉','4'); +insert into stuinfo values('s2505','梅超风','男','20','湖北武汉','5'); +insert into stuinfo values('s2506','陈旋风','男','19','美国硅谷','6'); + +insert into stuExam values('1','s2501','50','70'); +insert into stuExam values('2','s2502','60','65'); +insert into stuExam values('3','s2503','86','70'); +insert into stuExam values('4','s2504','40','80'); +insert into stuExam values('5','s2505','70','85'); +insert into stuExam values('6','s2506','85','90'); + +insert into stuMarks values('1','s2501','88'); +insert into stuMarks values('2','s2501','92'); +insert into stuMarks values('3','s2501','53'); +insert into stuMarks values('4','s2502','60'); +insert into stuMarks values('5','s2502','99'); +insert into stuMarks values('6','s2503','82'); + +-- 在如图的数据表上完成以下题目 +select * from stuexam; +select * from stuinfo; +select * from stumarks; +-- 1.查询出年龄比班上平均年龄大的学生的信息 +select * from stuinfo where stuAge> +(select avg(stuAge)age from stuinfo); +-- 2.查询出每个学生的学号,姓名,性别和选修课程的最高分(stuMarks) +select stuNO,stuName,stuSex,sco +from stuinfo left join +(select stuID,max(score) sco from stumarks group by stuID) a +on stuinfo.stuNO=a.stuID; +-- 3.查询出每个学生的学号,姓名,性别和考试平均分(stuExam) +select stuinfo.stuNO,stuName,stuSex,pjz from +stuinfo left join +(select stuNO,(writtenExam+labExam)/2 pjz from stuexam group by stuNO) a +on stuinfo.stuNO=a.stuNO; + +-- 4.查询性别是男并且年龄大于等于20的学生的信息(用两种方法实现:普通查询和子查询) +select * from stuinfo where stuSex='男' and stuAge>=20; +select * from stuinfo where +stuSex in (select stuSex from stuinfo where stuSex='男') +and stuAge>= any(select stuAge from stuinfo where stuAge>=20) +-- 5.查询出年龄比所有男生年龄都大的女生的信息 +select * from stuinfo where +stuAge >any +(select stuAge from stuinfo where stuSex='男') +and stuSex='女'; +-- 6.查询出所有选修课程都及格的学生的信息 (stuMarks) +select * from stuinfo inner join +(select stuID,score from stumarks) a +on stuinfo.stuNO=a.stuID +where score>=60 +-- 7.查询出参加考试的学生的信息(用表连接,in二种方法做)(stuMarks) +select a.* from stuinfo a right join stumarks b +on a.stuNO=b.stuID +group by stuNO; +select a.* from stuinfo a where stuNO in (select stuID from stumarks); +-- 8.查询出没有参加考试的学生的信息(用表连接,in二种方法做)(stuMarks) +select a.*,score from stuinfo a left join stumarks b +on a.stuNO=b.stuID +where score is null +group by stuNO; +select a.* from stuinfo a where stuNO not in (select stuID from stumarks); +-- 9.将有一门成绩成绩大于90分的学生的基本信息查询出来(stuMarks) +select a.*,score from stuinfo a right join stumarks b +on a.stuNO=b.stuID +where score>90; +-- 10.查询出平均成绩在80分以上的学生的基本信息(stuMarks) +select * from stuinfo where stuNO=any +(select stuID from stumarks group by stuID having avg(score)>80) +-- 11.查询出某同学所有考试成绩比“张秋利”同学所有分数都高的学生基本信息(stuMarks) +select * from stuinfo a right join stumarks b +on b.stuID =a.stuNO +group by b.score +having score> +(select max(score) from +(select a.stuName,score from stuinfo a right join stumarks b +on b.stuID =a.stuNO +group by b.score +having a.stuName='张秋利') a); +-- 12.查询出某同学所有考试成绩只需要比“张秋利”同学某个分数高的学生基本信息(stuMarks) +select * from stuinfo a right join stumarks b +on b.stuID =a.stuNO +group by b.score +having score>any +(select score from +(select a.stuName,score from stuinfo a right join stumarks b +on b.stuID =a.stuNO +group by b.score +having a.stuName='张秋利') a) +and stuName!='张秋利'; +-- 13.查询班上比所有男生年龄都要大的女生的信息 +select * from stuinfo where +stuAge >any +(select stuAge from stuinfo where stuSex='男') +and stuSex='女'; +-- 14.查询出只是比某个男生年龄大的女生的信息 +select * from stuinfo where +stuAge >any +(select min(stuAge) from stuinfo where stuSex='男') +and stuSex='女'; \ No newline at end of file diff --git "a/22\346\226\275\346\231\237\345\256\270/20230308 \345\244\247\344\275\234\344\270\232.sql" "b/22\346\226\275\346\231\237\345\256\270/20230308 \345\244\247\344\275\234\344\270\232.sql" new file mode 100644 index 0000000000000000000000000000000000000000..90c3f2c29f6150f1d5172e0a02ec03094eea77a7 --- /dev/null +++ "b/22\346\226\275\346\231\237\345\256\270/20230308 \345\244\247\344\275\234\344\270\232.sql" @@ -0,0 +1,131 @@ + + +-- 1. 根据前面提供的表结构和表数据,创建数据库并分别创建这张四张表;并插入相关数据。(提醒:外键请注意建表顺序和插入数据的顺序) (30分) +create database xiaoshuo charset utf8; +use xiaoshuo; +create table author( + author_id int comment '作家编号' primary key, + author_name varchar(20) comment '作家姓名' not null unique key, + credits int comment '积分', + vip_id varchar(20) comment '等级编号' not null, + foreign key author(vip_id) references vip(vip_id) +); + +create table vip( + vip_id varchar(20) comment '等级编号' primary key, + vip_name varchar(20) comment '等级名称' not null unique key +); + +create table story( + story_id int comment '作品编号' primary key auto_increment, + 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 '浏览量', + foreign key (author_id) references author(author_id), + foreign key (type_id) references type(type_id) +); + +create table type( + type_id varchar(20) comment '类型编号' primary key, + type_name varchar(20) comment '类型名称' not null unique key +); + +insert into author values('1001',' 朱逸群',' 600 ',' VIP01'), +('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 column 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) +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) +insert into story values('11','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 author_id 作者编号,story_name 作品名称 +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 a where 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 author_name,credits,vip_id +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 between 100 and 1000 +order by credits; +-- 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) 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 avg(credits) 平均积分,count(author_name) 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 type_id 分类编号,count(story_name) 小说数量 +from story +group by type_id +having count(story_name)>=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 作品编号,story_name 作品名称,type_id 类型编号,views_number 浏览量 +from story +having min(views_number); +-- 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 * from story a right join +(select author_id,vip_name +from author a inner join vip b +on a.vip_id=b.vip_id +where vip_name=' 白银作家') b +on a.author_id=b.author_id +-- 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 * from story a right join +(select * from author a where author_id=any +(select author_id from story +where views_number>5000) +) b +on a.author_id=b.author_id +where 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 c.story_id 小说编号,c.story_name 小说名称,views_number 浏览量,d.type_name 分类名称,a.author_name 作者姓名,a.credits 作者积分,b.vip_name 作者等级名称 from +author a left join vip b +on a.vip_id=b.vip_id +left join story c +on a.author_id=c.author_id +left join type d +on c.type_id=d.type_id +group by views_number,a.credits +