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Merge branch 'master' of https://github.com/CyC2018/CS-Notes

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CyC2018 2019-06-20 22:23:41 +08:00
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README.md
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更多精彩内容将发布在微信公众号 CyC2018 上，你也可以在公众号后台和我交流学习和求职相关的问题。另外，公众号提供了该项目的 PDF 等离线阅读版本，后台回复 "下载" 即可领取。公众号也提供了一份技术面试复习大纲，不仅系统整理了面试知识点，而且标注了各个知识点的重要程度，从而帮你理清多而杂的面试知识点，后台回复 "大纲" 即可领取。我基本是按照这个大纲来进行复习的，对我拿到了 BAT 头条等 Offer 起到很大的帮助。你们完全可以和我一样根据大纲上列的知识点来进行复习，就不用看很多不重要的内容，也可以知道哪些内容很重要从而多安排一些复习时间。
<br>
<div align="center"><img width="500px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报3.png"></img></div>
<div align="center"><img width="500px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报4.png"></img></div>
### 更多内容

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assets/Test.cpp
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#include <iostream>
using namespace std;
int main() {
cout << "CyC OvO" << endl;
}

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assets/Test.java
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public class Test {
public static void main(String args[]) {
System.out.println("CyC OvO");
}
}

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assets/Test.py
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print ("CyC OvO");

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assets/download.md
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离线版本由公众号 **CyC2018** 发布，最新版本也会在上面及时发布，在公众号后台回复 **离线下载** 即可获取下载链接。
<div align="center"><img width="460px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报3.png"></img></div>
<div align="center"><img width="460px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报4.png"></img></div>

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other/sql 经典练习题.sql
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use fuxi;
CREATE TABLE STUDENT
(
SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATETIME,
CLASS VARCHAR(5)
);
CREATE TABLE COURSE
(
CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL
);
CREATE TABLE SCORE
(
SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL
);
CREATE TABLE TEACHER
(
TNO VARCHAR(3) NOT NULL,
TNAME VARCHAR(4) NOT NULL,
TSEX VARCHAR(2) NOT NULL,
TBIRTHDAY DATETIME NOT NULL,
PROF VARCHAR(6),
DEPART VARCHAR(10) NOT NULL
);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (108, '曾华'
, '男', '1977-09-01', 95033);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (105, '匡明'
, '男', '1975-10-02', 95031);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (107, '王丽'
, '女', '1976-01-23', 95033);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (101, '李军'
, '男', '1976-02-20', 95033);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (109, '王芳'
, '女', '1975-02-10', 95031);
INSERT INTO STUDENT (SNO, SNAME, SSEX, SBIRTHDAY, CLASS) VALUES (103, '陆君'
, '男', '1974-06-03', 95031);
INSERT INTO COURSE (CNO, CNAME, TNO) VALUES ('3-105', '计算机导论', 825);
INSERT INTO COURSE (CNO, CNAME, TNO) VALUES ('3-245', '操作系统', 804);
INSERT INTO COURSE (CNO, CNAME, TNO) VALUES ('6-166', '数据电路', 856);
INSERT INTO COURSE (CNO, CNAME, TNO) VALUES ('9-888', '高等数学', 100);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (103, '3-245', 86);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (105, '3-245', 75);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (109, '3-245', 68);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (103, '3-105', 92);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (105, '3-105', 88);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (109, '3-105', 76);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (101, '3-105', 64);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (107, '3-105', 91);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (101, '6-166', 85);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (107, '6-106', 79);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (108, '3-105', 78);
INSERT INTO SCORE (SNO, CNO, DEGREE) VALUES (108, '6-166', 81);
INSERT INTO TEACHER (TNO, TNAME, TSEX, TBIRTHDAY, PROF, DEPART)
VALUES (804, '李诚', '男', '1958-12-02', '副教授', '计算机系');
INSERT INTO TEACHER (TNO, TNAME, TSEX, TBIRTHDAY, PROF, DEPART)
VALUES (856, '张旭', '男', '1969-03-12', '讲师', '电子工程系');
INSERT INTO TEACHER (TNO, TNAME, TSEX, TBIRTHDAY, PROF, DEPART)
VALUES (825, '王萍', '女', '1972-05-05', '助教', '计算机系');
INSERT INTO TEACHER (TNO, TNAME, TSEX, TBIRTHDAY, PROF, DEPART)
VALUES (831, '刘冰', '女', '1977-08-14', '助教', '电子工程系');
-- 1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select
SNAME,
SSEX,
CLASS
from STUDENT;
-- 2、 查询教师所有的单位即不重复的Depart列。
select distinct DEPART
from TEACHER1;
-- 3、 查询Student表的所有记录。
select *
from STUDENT;
-- 4、 查询Score表中成绩在60到80之间的所有记录。
select *
from SCORE
where DEGREE > 60 and DEGREE < 80;
-- 5、 查询Score表中成绩为85，86或88的记录。
select *
from SCORE
where DEGREE = 85 or DEGREE = 86 or DEGREE = 88;
-- 6、 查询Student表中“95031”班或性别为“女”的同学记录。
select *
from STUDENT
where CLASS = '95031' or SSEX = '女';
-- 7、 以Class降序查询Student表的所有记录。
select *
from STUDENT
order by CLASS desc;
-- 8、 以Cno升序、Degree降序查询Score表的所有记录。
select *
from SCORE
order by CNO asc, DEGREE desc;
-- 9、 查询“95031”班的学生人数。
select count(*)
from STUDENT
where CLASS = '95031';
-- 10、查询Score表中的最高分的学生学号和课程号。
select
sno,
CNO
from SCORE
where DEGREE = (
select max(DEGREE)
from SCORE
);
-- 11、查询‘3-105’号课程的平均分。
select avg(DEGREE)
from SCORE
where CNO = '3-105';
-- 12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。
select
avg(DEGREE),
CNO
from SCORE
where cno like '3%'
group by CNO
having count(*) > 5;
-- 13、查询最低分大于70，最高分小于90的Sno列。
select SNO
from SCORE
group by SNO
having min(DEGREE) > 70 and max(DEGREE) < 90;
-- 14、查询所有学生的Sname、Cno和Degree列。
select
SNAME,
CNO,
DEGREE
from STUDENT, SCORE
where STUDENT.SNO = SCORE.SNO;
-- 15、查询所有学生的Sno、Cname和Degree列。
select
SCORE.SNO,
CNO,
DEGREE
from STUDENT, SCORE
where STUDENT.SNO = SCORE.SNO;
-- 16、查询所有学生的Sname、Cname和Degree列。
SELECT
A.SNAME,
B.CNAME,
C.DEGREE
FROM STUDENT A
JOIN (COURSE B, SCORE C)
ON A.SNO = C.SNO AND B.CNO = C.CNO;
-- 17、查询“95033”班所选课程的平均分。
select avg(DEGREE)
from SCORE
where sno in (select SNO
from STUDENT
where CLASS = '95033');
-- 18、假设使用如下命令建立了一个grade表：
create table grade (
low numeric(3, 0),
upp numeric(3),
rank char(1)
);
insert into grade values (90, 100, 'A');
insert into grade values (80, 89, 'B');
insert into grade values (70, 79, 'C');
insert into grade values (60, 69, 'D');
insert into grade values (0, 59, 'E');
-- 现查询所有同学的Sno、Cno和rank列。
SELECT
A.SNO,
A.CNO,
B.RANK
FROM SCORE A, grade B
WHERE A.DEGREE BETWEEN B.LOW AND B.UPP
ORDER BY RANK;
-- 19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。
select *
from SCORE
where CNO = '3-105' and DEGREE > (
select DEGREE
from SCORE
where SNO = '109' and CNO = '3-105'
);
set @@global.sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
set sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
-- 20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录
select *
from SCORE
where DEGREE < (select MAX(DEGREE)
from SCORE)
group by SNO
having count(*) > 1;
-- 21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
-- 同19
-- 22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
select
SNO,
SNAME,
SBIRTHDAY
from STUDENT
where year(SBIRTHDAY) = (
select year(SBIRTHDAY)
from STUDENT
where SNO = '108'
);
-- 23、查询“张旭“教师任课的学生成绩。
select *
from SCORE
where cno = (
select CNO
from COURSE
inner join TEACHER on COURSE.TNO = TEACHER.TNO and TNAME = '张旭'
);
-- 24、查询选修某课程的同学人数多于5人的教师姓名。
select TNAME
from TEACHER
where TNO = (
select TNO
from COURSE
where CNO = (select CNO
from SCORE
group by CNO
having count(SNO) > 5)
);
-- 25、查询95033班和95031班全体学生的记录。
select *
from STUDENT
where CLASS in ('95033', '95031');
-- 26、查询存在有85分以上成绩的课程Cno.
select cno
from SCORE
group by CNO
having MAX(DEGREE) > 85;
-- 27、查询出“计算机系“教师所教课程的成绩表。
select *
from SCORE
where CNO in (select CNO
from TEACHER, COURSE
where DEPART = '计算机系' and COURSE.TNO = TEACHER.TNO);
-- 28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof
select
tname,
prof
from TEACHER
where depart = '计算机系' and prof not in (
select prof
from TEACHER
where depart = '电子工程系'
);
-- 29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。
select
CNO,
SNO,
DEGREE
from SCORE
where CNO = '3-105' and DEGREE > any (
select DEGREE
from SCORE
where CNO = '3-245'
)
order by DEGREE desc;
-- 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.
SELECT *
FROM SCORE
WHERE DEGREE > ALL (
SELECT DEGREE
FROM SCORE
WHERE CNO = '3-245'
)
ORDER by DEGREE desc;
-- 31、查询所有教师和同学的name、sex和birthday.
select
TNAME name,
TSEX sex,
TBIRTHDAY birthday
from TEACHER
union
select
sname name,
SSEX sex,
SBIRTHDAY birthday
from STUDENT;
-- 32、查询所有“女”教师和“女”同学的name、sex和birthday.
select
TNAME name,
TSEX sex,
TBIRTHDAY birthday
from TEACHER
where TSEX = '女'
union
select
sname name,
SSEX sex,
SBIRTHDAY birthday
from STUDENT
where SSEX = '女';
-- 33、查询成绩比该课程平均成绩低的同学的成绩表。
SELECT A.*
FROM SCORE A
WHERE DEGREE < (SELECT AVG(DEGREE)
FROM SCORE B
WHERE A.CNO = B.CNO);
-- 34、查询所有任课教师的Tname和Depart.
select
TNAME,
DEPART
from TEACHER a
where exists(select *
from COURSE b
where a.TNO = b.TNO);
-- 35、查询所有未讲课的教师的Tname和Depart.
select
TNAME,
DEPART
from TEACHER a
where tno not in (select tno
from COURSE);
-- 36、查询至少有2名男生的班号。
select CLASS
from STUDENT
where SSEX = '男'
group by CLASS
having count(SSEX) > 1;
-- 37、查询Student表中不姓“王”的同学记录。
select *
from STUDENT
where SNAME not like "王%";
-- 38、查询Student表中每个学生的姓名和年龄。
select
SNAME,
year(now()) - year(SBIRTHDAY)
from STUDENT;
-- 39、查询Student表中最大和最小的Sbirthday日期值。
select min(SBIRTHDAY) birthday
from STUDENT
union
select max(SBIRTHDAY) birthday
from STUDENT;
-- 40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
select *
from STUDENT
order by CLASS desc, year(now()) - year(SBIRTHDAY) desc;
-- 41、查询“男”教师及其所上的课程。
select *
from TEACHER, COURSE
where TSEX = '男' and COURSE.TNO = TEACHER.TNO;
-- 42、查询最高分同学的Sno、Cno和Degree列。
select
sno,
CNO,
DEGREE
from SCORE
where DEGREE = (select max(DEGREE)
from SCORE);
-- 43、查询和“李军”同性别的所有同学的Sname.
select sname
from STUDENT
where SSEX = (select SSEX
from STUDENT
where SNAME = '李军');
-- 44、查询和“李军”同性别并同班的同学Sname.
select sname
from STUDENT
where (SSEX, CLASS) = (select
SSEX,
CLASS
from STUDENT
where SNAME = '李军');
-- 45、查询所有选修“计算机导论”课程的“男”同学的成绩表
select *
from SCORE, STUDENT
where SCORE.SNO = STUDENT.SNO and SSEX = '男' and CNO = (
select CNO
from COURSE
where CNAME = '计算机导论');
-- 46、使用游标方式来同时查询每位同学的名字，他所选课程及成绩。
declare
cursor student_cursor is
select S.SNO,S.SNAME,C.CNAME,SC.DEGREE as DEGREE
from STUDENT S, COURSE C, SCORE SC
where S.SNO=SC.SNO
and SC.CNO=C.CNO;
student_row student_cursor%ROWTYPE;
begin
open student_cursor;
loop
fetch student_cursor INTO student_row;
exit when student_cursor%NOTFOUND;
dbms_output.put_line( student_row.SNO || '' ||
student_row.SNAME|| '' || student_row.CNAME || '' ||
student_row.DEGREE);
end loop;
close student_cursor;
END;
/
-- 47、 声明触发器指令，每当有同学转换班级时执行触发器显示当前和之前所在班级。
CREATE OR REPLACE TRIGGER display_class_changes
AFTER DELETE OR INSERT OR UPDATE ON student
FOR EACH ROW
WHEN (NEW.sno > 0)
BEGIN
dbms_output.put_line('Old class: ' || :OLD.class);
dbms_output.put_line('New class: ' || :NEW.class);
END;
/
Update student
set class=95031
where sno=109;
-- 48、 删除已设置的触发器指令
DROP TRIGGER display_class_changes;