SQL Server数据库按百分比查询出表中的记录数

create procedure pro_Percent  
( 
 @ipercent [int] =0        --默认不返回 
) 
as 
begin 
select  (@ipercent ) percent  from books 
end 

create procedure pro_Percent  
( 
 @ipercent [int] =0  
) 
as 
begin 
select ((select COUNT () from books)(@ipercent)/100)  from books 
end 
exec pro_Percent '10'    --执行存储过程

declare @studentname_1 
 
exec myprocedure