--create database xs1
create table xsda
(
Id int not null,
Sname varchar (64),
Age int,
Gendaer char (4),
Mark float
);
insert into xsda
values
(242701,'å¼ 2',18,'ç”·',80),
(242702,'å¼ 1',15,'女',99),
(242703,'å¼ 5',19,'ç”·',100),
(242704,'å¼ 3',17,'ç”·',70),
(242706,'å¼ 4',15,'ç”·',90);
select* from xsda;
create view v_xsda
as
select * from xsda
where < 16
go
select * from xsda
create unique nonclustered index ind_id
on xsda (Id,Sname)