sql将课程表中所有必修

⑴ 把课程表存进SQL数据库里，大家有什么好的想法

课程表（第几节课，周一，周二，周三···周日）

⑵ SQL命令 “学生”数据库中有 “学生表”、“课程表”和 “成绩表”。 “学生表”中包含学号、姓名

1、首先在电脑上打开数据库软件。然后附加有学生表和成绩表的数据库。

⑶ 将学生表、成绩表、课程表三张表中的数据作为基础数据，写出相关SQL语句，谢谢

--查询所有学生的成绩信息（无成绩的学生也需显示）
SELECTSname,Cname,Grade
.Sno=SC.Sno
LEFTJOINCourseONCourse.Cno=SC.Cno
--查询8002课程的平均分、最高分以及课程名称，且平均分保留2位小数
SELECTCAST(AVG(Grade)ASNUMERIC(5,2))平均分,MAX(Grade)最高分,Cname课程名称
FROMCoruseJOINSCONCourse.Cno=SC.Cno
WHERECourse.Cno='8002'

⑷ 请问在SQL语句中，实现选课表中的课程号与课程表中的课程号建立关联，这样建立对吗

前提： 选课表中的课程号字段已设置为主键
--在创建表时语句同楼上

--新增字段并加上外键约束
ALTER TABLE 课程 add cno varchar(20) NOT NULL
constraint 选课_Fore FOREIGN KEY REFERENCES 选课(课程号)

--给现有字段添加外键约束
ALTER TABLE 课程
add constraint 选课_Fore FOREIGN KEY (课程号) REFERENCES 选课(课程号)

⑸ 从学生表、选课表、课程表，试用SQL语句表示下列查询语句： （1）列出全部学生的信息。

1.

SELECT*
FROM学生表

2.

SELECT学号,姓名
FROM学生表
WHERE专业内='软件测试专业'

3.

SELECT	课程号
FROM	课程表
WHERE	类容型='必修课'

⑹ sql 中删除选课表记录，将学名为102，课程号为102的记录删除

delete from 选课表 where 学名='102' and 课程号='102';

⑺ SQL语句的一道题 三个基本表：学生表(Student)、课程表（Course）、学生选课表（SC）

1. select * from SC
2. select Sname，Sage from Student where Sdept = '计算机'
3. select Sno,Cno,Grade from SC where Grade >= 70 and Grade <= 80
4. select Sname,Sage from Student where Sage between 18 and 20 and Ssex = '男'
5. select top 1 Grade from SC where Cno = 'C01'
6. select max(Sage),min(Sage) from Student
7. select Sdept,sum(Sno) from Student group by Sdept
8. select course.Cname,sum(sc.Sno),max(Grade) from SC
join studet on Student.Sno = SC.Sno
join Course on Course.Cno = SC.Cno
group by course.cname,max(grade)

9. select sum(Cno),avg(Grade) from SC
join Course on Course.Cno = SC.Cno
join Student on Student.Sno= SC.Sno
order by SC.Sno

10. select Stuent.Sno，Stuent.Sname，sum(Grade) A from SC
join Student on Student.Sno = SC.Sno
group by sc.Sno,student.Sname
having A > 200

11. select Student.Sname,Student.Sdept from Student
join Course on Course.Cno = SC.Cno
join SC on SC.Sno = Student.Sno
where SC.Cno = 'C02'

12. select Student.sname,course.cno,sc.grade from sc
join student on student.sno = sc.sno
join course on course.cno = sc.cno
where sc.grade >= 80
order by sc.grade desc

13. select cno,cname from
(
select course.cno,course.cname,sun(sno) from student
join course on course.cno = sc.cno
join sc on sc.sno = student.sno
group by cno,cname
having sun(sno) > 0
)

14. ① select student.sname,student.sdept from
(
select student.sname,student.sdept,course.cname from student
join sc on sc.sno = student.sno
join course on course.cno = sc.cno
where course.cname = 'C01'
)

② select student.sno,student.sname from
(
select student.sno,student.sname,student.sdept,sc.grade from sc
join student on student.sno = sc,sno
where student.sdept = '信息' and sc.grade >= 80
)

③ select top 1 student.sname from
(
select student.sname,student.sdept,sum(sc.grade) from sc
join student on student.sno = sc.sno
where student.sdept = '计算机'
group by student.sname,student.sdept
order by
)

15. delete from sc where grade < 50
16. update sc set grade += 5 from sc
join course on course.cno = sc.cn
join student on student.sno = sc.sno
where student.sno =
(
select student.sno from sc
join course on course.cno = sc.cno
where course.cname = 'c01'
)

17. update sc set grade += 10 from sc
join student on student.sno = sc.sno
where student.sno =
(
select student.sno from student
join sc on sc.sno = student.sno
join course on course.cno = sc.cno
where student.sdept = '计算机' and course.cname = '计算机文化基础'
)

18. create view [A] as
select student.sno,student.sname,student.sdept,course.cno,course.cname,sc.grade from sc
join student on student.sno = sc.sno
join course on course.cno = sc.cno

19. create view [A] as
select student.sno,avg(sc.grade) from sc
join student on student.sno = sc.sno
group by student.sno

20. create view [A] as
select student.sno,sum(sc.grade) from sc
join student on student.sno = sc.sno
group by student.sno

21. create index A on student(sname)
22. 不会

⑻ 在sql数据库中所授课程表与新增所授课程表的关系

第一个表是学生表Student，包含三个字段，学生id（stu_id） 和 学生姓名（stu_name）和课程id（les_id）
Create Table [dbo].Student(
stu_id [uniqueidentifier] NOT NULL,
stu_name [nvarchar](425) NOT NULL,
les_id [uniqueidentifier] NOT NULL
)
第二个表课程表Lesson，两个字段，课程id（les_id）和课程名称（les_name）
Create Table [dbo].Lesson(
les_id [uniqueidentifier] NOT NULL,
les_name [nvarchar](425) NOT NULL
)
第三个表学生成绩表Score,三个字段课程id（les_id），学生id（stu_id）和课程得分（les_score）
Create Table [dbo].Score(
les_id [uniqueidentifier] NOT NULL,
stu_id [uniqueidentifier] NOT NULL,
les_score [int] NOT NULL
)

⑼ 怎么用SQL_UPDATE命令将课程表中课程名为计算机基础的学时修改为4。

update 课程表 set 学时=4 where 课程名='计算机基础'

⑽ 怎么用sql语句查询课程表中的最高课时以及课程名称

select top 1 课时, 课程名称 from 课程表
order by 课时 desc