请教SQL转换字符问题 - .NET技术 / ASP.NET

SQL code:

declare @pagecount int
declare @sql varchar(500)
set @pagecount=10
set @sql='select top '+cast(@pagecount as varchar(10))+' * from book order by [ID] desc'
exec (@sql)



执行会报错“在将 varchar 值 'select top 10 * from book order by [ID] desc' 转换成数据类型 int 时失败。”

请问这里怎么拼字符？如果表名是变量请问怎么拼写？
谁有SQL拼字符的资料？发网址，谢谢

---

刚试了下，上面正确，但下面这段执行的时候出问题？

创建存储过程
SQL code:

create proc book_page3
@page int,@pagecount int
as
declare @sqls varchar(500)
declare @page2 int
declare @counts int
declare @sqlc int
declare @sqll int

select @counts=count(*) from book
set @sqlc=@counts/@pagecount+1
if @page<=@sqlc and @page<>0
begin
if @page<>1
begin
set @page2=@pagecount*(@page-1)
select top (@pagecount) * from book where [ID]<(select min(ID) from (select top (@page2) ID from book order by [ID] desc)b) order by [ID] desc
end

else
begin
set @page2=@pagecount*@page
select top (@pagecount) * from book order by [ID] desc
end
end
else
begin
set @sqll='select top '+cast(@pagecou