SQL²åÈëÀýÌâ

--´´½¨±íTongXunLu
CREATE TABLE TongXunLu
 (
 [tName] nvarchar(30),
 [tAddress] nvarchar(50),
 [tEmail] varchar(50)
 )
--´´½¨±í students
CREATE TABLE students
 (
 [sId] int IDENTITY (1, 1) primary key NOT NULL ,
 [sName] varchar (50)   NOT NULL ,
 [sAddress] varchar (50) default 'daxing'   ,
 [sEmail] varchar (50) check([sEmail] like '%@%')   ,
 [sSex] bit NOT NULL
 )
insert into students (sname,saddress,semail,ssex) values ('ÕŹûÀÏ',default,'a@a',1)
insert into [students] (sname,saddress,semail,ssex) values ('ÀîÑ°»¶',null,'b@b',1)
insert into [students] (sname,saddress,semail,ssex) values ('Áîºü³å',default,'c@c',1)
insert into [students] (sname,saddress,semail,ssex) values ('³ÌÁéËØ',null,'d@f',0)
insert into [students] (sname,saddress,semail,ssex) values ('Ц¹þ¹þ','beijing','e@e',0)
insert into [students] (sname,saddress,semail,ssex) values ('ÀֺǺÇ','neimenggu','f@f',1)
insert into [students] (sname,saddress,semail,ssex) values ('AAAAA',default,'a@a',1)
insert into [students] (sname,saddress,semail,ssex) values ('BBBBB',null,'b@b',1)
insert into [students] (sname,saddress,semail,ssex) values ('CCCCC',default,'c@c',1)
insert into [students] (sname,saddress,semail,ssex) values ('DDDDDD',null,'d@f',0)
insert into [students] (sname,saddress,semail,ssex) values ('EEEEE','beijing','e@e',0)
insert into [students] (sname,saddress,semail,ssex) values ('FFFFF','neimenggu','f@f',1)
insert into [students] (sname,saddress,semail,ssex) values ('GGGGGG',default,'a@a',1)
insert into [students] (sname,saddress,semail,ssex) values ('HHHHHH',null,'b@b',1)
insert into [students] (sname,saddress,semail,ssex) values ('IIIIII',default,'c@c',1)
insert into [students] (sname,saddress,semail,ssex) values ('JJJJJ',null,'d@f',0)
insert into [students] (sname,saddress,semail,ssex) values ('KKKKK','beijing','e@e',0)
insert into [students] (sname,saddress,semail,ssex) valu