步步为营-46-分页显示的SQL语句

--方法一:跳过多少行,选中多少行
--每页n条,选择第m页--n=2 m=3
--select top(n) * from 表 where 主键 not in (select top(m-1)*n 主键 from 表);
select  * from UserInfo
select top(2) * from UserInfo where Empid not in (select top((3-1)*2) EmpId from UserInfo);
--方法二,通过rowNumber函数,但是只能当作临时表
select * from(select * ,ROW_NUMBER() over (order by EmpId) as num from UserInfo) as T
where T.num between (3-1)*2+1 and 3*2;
--over开窗函数的的另一个用法
select top(2) * ,AVG(StuAge) over() as 平均年龄 from UserInfo;