Linq to Sql ------------------------复习（一）

create database StudentDB
go
use StudentDB
go
--班级表
create table classic
(
classID int identity(1,1) primary key,
className varchar(20) not null
)
go
insert into classic values('T102');
insert into classic values('T104');
insert into classic values('T110');
go
--学生表
CREATE TABLE stuInfo
(
stuName    NVARCHAR(20)    NOT NULL,
stuNo      NCHAR(6)        NOT NULL,
stuSex     NCHAR(4)        NOT NULL,
stuAge     int             NOT NULL,
stuSeat    int             IDENTITY(1,1),
classID    int             foreign key references classic(classID)
)
GO
INSERT INTO stuInfo VALUES('张秋丽','s25301','女',18,1)
INSERT INTO stuInfo VALUES('李斯文','s25303','男',22,2)
INSERT INTO stuInfo VALUES('李文才','s25302','男',31,3)
INSERT INTO stuInfo VALUES('马英','s25304','女',25,2)
INSERT INTO stuInfo VALUES('孙红雷','s25305','男',32,3)
INSERT INTO stuInfo VALUES('欧阳俊雄','s25306','男',28,1)
INSERT INTO stuInfo VALUES('江琳','s25307','女',23,1)
go
--课程表
CREATE TABLE stuMarks
(ExamNo CHAR(7) primary key NOT NULL,
stuNo NCHAR(6) NOT NULL,
writtenExam SMALLINT NOT NULL,
LabExam SMALLINT NOT NULL)
GO
INSERT INTO stuMarks VALUES('S271811','s25301',87,88)
INSERT INTO stuMarks VALUES('S271812','s25302',67,52)
INSERT INTO stuMarks VALUES('S271813','s25303',65,62)
INSERT INTO stuMarks VALUES('S271814','s25304',80,58)
INSERT INTO stuMarks VALUES('S271815','s25305',50,90)
INSERT INTO stuMarks VALUES('S271816','s25306',77,82)
go
alter table stuInfo
add constraint PK_stuNo primary key(stuNo)
alter table stuMarks
add constraint FK_stuno foreign key (stuNo) references stuinfo(stuno)
go
select * from classic
select * from stuInfo
select * from stuMarks