diff --git "a/37 \351\227\253\351\233\252\350\216\262/20230308 \345\244\247\344\275\234\344\270\232.md" "b/37 \351\227\253\351\233\252\350\216\262/20230308 \345\244\247\344\275\234\344\270\232.md" new file mode 100644 index 0000000000000000000000000000000000000000..384da3ee23072dfc85e3610445c921ac945d628f --- /dev/null +++ "b/37 \351\227\253\351\233\252\350\216\262/20230308 \345\244\247\344\275\234\344\270\232.md" @@ -0,0 +1,165 @@ +```mysql +create database xiaoshuo charset utf8; +use xiaoshuo ; +create table vip( +vip_id varchar(20) PRIMARY key, +vip_name varchar(20) not null + +); +INSERT into vip values ('VIP01','青铜作家'), + ('VIP02','白银作家'), + ('VIP03','黄金作家'), + ('VIP04','钻石作家'); + SELECT *from vip; +drop table if exists type; +create table type ( +type_id varchar(20) PRIMARY key, +type_name varchar(20) not null unique key + +); + +INSERT into type values ('L01','玄幻'), +('L02','奇幻'), +('L03','武侠'), +('L04','仙侠'), +('L05','都市'); + + SELECT *from type; + +drop table if exists author; +create table author ( +author_id int PRIMARY key , +author_name varchar(20) not null unique key, +credits int , +vip_id varchar(20) not null , +foreign key(vip_id) REFERENCES vip (vip_id) +); +desc author; + +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'); + + + SELECT *from author; + + + + +create table story ( +story_id int PRIMARY KEY auto_increment, +author_id int, +type_id varchar(20), +story_name varchar(50), +views_number int, +foreign key(author_id) REFERENCES author(author_id), +foreign key(type_id) REFERENCES type(type_id) +); + +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'); + + +SELECT * from story; + + + + + + +### 3、题目 + +-- > 所有题目要求使用SQL语句完成 +-- + +-- 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) +-- + +-- 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); +desc story; + +-- 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'; +SELECT *from author; +-- 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; +SELECT *from author; +-- 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'); +select * from story; +-- 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=100+views_number where story_name='拖拉机大战蜘蛛侠'; +select * from story; +-- 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_id=5; +select * from story; +-- 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,story_name 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 author.vip_id='vip04'; +-- 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 credits,vip_id ,author_name 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 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 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 * from type +-- 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 DISTINCT author.author_name,vip.vip_name from author left join vip on author.vip_id=vip.vip_id left join story on author.author_id=story.author_id where vip.vip_id='vip02' and story.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 story_name from story where views_number<1000 and author_id in (select author.author_id from author left join story on author.author_id = story.author_id where views_number >5000); + +-- 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_id 分类名称,author.author_id 作者姓名,credits 作者积分,vip_id 作者等级 from story left join author on author.author_id = story.author_id ORDER BY views_number desc,credits desc; +-- + +-- + +-- + + + + + + + + + + + + + + + + + + +``` + diff --git "a/37 \351\227\253\351\233\252\350\216\262/20230309 \344\275\234\344\270\232.md" "b/37 \351\227\253\351\233\252\350\216\262/20230309 \344\275\234\344\270\232.md" new file mode 100644 index 0000000000000000000000000000000000000000..438026abc0a8018048a77d612454635845fe843b --- /dev/null +++ "b/37 \351\227\253\351\233\252\350\216\262/20230309 \344\275\234\344\270\232.md" @@ -0,0 +1,154 @@ +```mysql +create database yxll charset utf8; +use yxll; +create table stuinfo( +stuNO varchar(6) , +stuName varchar(6), +stuAge varchar(4) , +stuAddress varchar(10), +stuSeat varchar(4), +stuSex varchar(2) +); + +desc stuinfo; +INSERT into stuinfo values('s2501','张秋利',20,'美国硅谷',1,'1'), + ('s2502','李斯才',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','陈风',20,'美国硅谷',7,'0'); + select *from stuinfo; + + +create table stuExam( +examNO varchar(3), +stuNO varchar(6), +writtenExam varchar(4), +labExam varchar(4) +); +desc stuExam; +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'); + +select *from stuExam ; + + +-- 按图片所给的数据进行数据表的建立和数据插入,然后进行以下查询操作 +-- + +-- 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 学生学号,stuName 学生姓名,stuAge 学生年龄, stuAddress 学生地址,stuSeat 学生座位号, stuSex 学生性别 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 examNO 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 stuAddress from stuInfo GROUP BY stuAddress; +-- + +-- 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 +-- + +SELECT stuAge 学生年龄 from stuInfo GROUP BY stuAge ; + +-- 8.查询学生信息表(stuInfo)中前3行记录 +-- + +select * from stuinfo LIMIT 0,3; +-- 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 LIMIT 0,4; + +-- 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 desc ,stuSeat asc ; +-- + +-- 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 avg(stuage),stuAddress from stuinfo GROUP BY stuAddress; + +-- 26.查询男女生的分别的年龄总和 + +SELECT sum(stuage),stuSex 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 avg(stuage), sum(stuage),stuAddress from stuinfo GROUP BY stuAddress,stuSex ; + + +``` + +