1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

create database zhangboSTU
on primary  //数据库文件
(name = 'zhangbo_data',filename = 'C:\data\zhangbo_data.mdf',size = 5MB,maxsize = 20MB,filegrowth = 20%    //曾长方式
)
log on      //日志文件
(name = 'zhangbo_log',filename = 'C:\data\zhangbo_log.log',size = 2MB,maxsize = 10MB,filegrowth = 2MB
)

1
2
3
4
5
6
7
8
9
10
11
12
13
14

//增加数据库空间
alter database 数据库名
modify file
(name = 逻辑文件名，,
size = 文件大小)
//增加数据库文件
alter database 数据库名
add file | add log file
()
//删除数据库文件
alter database 数据库名
remove file 文件名

1

drop database 数据库名

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

create table course(cno char(4) primary key not null,  //主键cname char(10),classhour tinyint,credit tinyint
)
create table student(sno char(7) primary key not null,sname nvarchar(10) not null,ssex nchar(1) not null,sage tinyint ,en_time datetime,specialty nvarchar(50),grade nvarchar(50)
)

1
2
3
4
5
6
7
8

use teaching
go
alter table student
alter column sname nvarchar(20) NULL
alter table course
add teacher nvarchar(20)
alter table student
drop column sage

1
2
3
4
5
6
7
8
9

create table sc
(sno char(7) not null,cno char(4)not null,score intconstraint pk_ss primary key(sno,cno),constraint stu_foreign foreign key(sno) references student(sno),constraint cou_foreign foreign key(cno) references course(cno)
)

1
2

alter table student
add constraint pk_st primary key(sno)

1
2

alter table student
add constraint uk_st unique(id)

1
2

alter table student
add constraint dk_stu default(getdate()) for en_time with values

1
2

alter table sc
add constraint cj_constraint CHECK(score>=0 and score<=100)

1
2

insert into score(sno,cno,score)
values(130200,'C01',90),(130220,'C02',50)

1

update score set cno='C03' where sno='130220'

1

delete student where sno='130200'

1
2
3
4
5

merge ProductNew as d using Product as s
on s.ProductID = d.ProductID
when not matched then insert(ProductID,ProductName,price)
values(s.ProductID,s.ProductName,price);
select * from ProductNew

1
2

select sno as 学号 , sname 姓名 from student
select sno,cno,score150 = score *1.5 from sc

1
2
3
4
5
6
7

select * from sc where score>=60
select * from student where specialty='计算机' and ssex='男'
select * from student where specialty='计算机' or ssex='男'
select * from sc where score not between  80 and 90
select * from student where specialty in('计算机','通信')
select * from student where sname like '张%'
select * from sc where score is null

1
2
3
4
5
6
7
8
9
10
11
12
13
14

select ssex , COUNT(ssex) as 人数 from student
group by ssex
select sno ,COUNT(cno) as 学修课程数 from sc
group by sno having COUNT(cno)>=2
select AVG(score) as 平均成绩 from sc where sno=1302001
select cno,AVG(score) as 平均成绩 ,count(sno) as 选课人数 from sc
group by cno
with cube
select specialty,ssex,count(*) as 人数 from student
group by specialty,ssex
with rollup
select specialty,ssex,count(*) as 人数 from student
group by ssex,specialty
with cube

1
2
3
4
5
6
7

select student.sname,sc.cno,sc.score from student inner join sc on student.sno=sc.sno
select a.sname,b.cno,b.score from student as a inner join sc as b on a.sno=b.sno
where a.specialty='计算机'
order by a.sname
compute avg(b.score) by a.sname
select * from student a inner join student b
on a.sname=b.sname and a.sno<>b.sno

1
2
3

select student.*,sc.cno,sc.score from student left join sc on student.sno=sc.sno
select course.* ,sc.score,student.sname,student.sno from course full join sc on course.cno=sc.cno
full join student on student.sno=sc.sno

1
2
3
4
5
6
7
8

select a.sno,a.sname,a.specialty
from student a,student b
where a.specialty=b.specialty and b.sname = '沈艳'
select sname,score from student,sc where student.sno=sc.sno and cno = 'C001' and sc.score >(select score from sc where cno = 'C001' and sno =(select sno from student where sname = '郑丽')
)

1
2

CAST('12.5' AS int)
cast(@i as varchar)

1
2

sp_help student
sp_columns student

1
2
3
4
5

create function stu_func(@specialty nvarchar(50)) returns table
as return
(select a.sno,a.sname,b.cno,b.score from student a,sc b where specialty=@specialty and a.sno=b.sno)select * from stu_func('计算机')

1
2
3
4
5
6

create function stu_score(@no char(7)) returns @score table(xs_no char(7),xs_name char(6),kc_name char(10),cj int,xf int)
as
begininsert into @score select s.sno,s.sname,c.cname,c.credit,sc.score from student s,course c,sc sc where s.sno=sc.sno and c.cno=sc.cno and s.sno=@no
return
end

1
2
3
4
5
6
7
8
9
10
11
12

create procedure stu_avg
as
select sno,AVG(score) as 'avgstore' from sc
group by sno
go
create procedure getstu @number char(7)
as
select stu.sno,sname,specialty,s.cno,s.score from sc s,student stu
where s.sno=@number and s.sno=stu.sno
compute avg(score)
go
exec getstu 1302001

1
2
3
4
5
6
7

create procedure avg_price @gn varchar(20) , @avgp int output
asselect @avgp=AVG(price) from goods where gname=@gn
declare @avgprice int
exec avg_price '电视',@avgprice output
print cast(@avgprice as char(10))
go

1
2
3

alter table student
disable trigger all
enable trigger all

1
2
3
4

begin transaction  定义一个事务的开始
commit tran         提交一个事务
rollback tran       回滚事务
save transaction    在事务内设置保存点