存储过程中这样使用为什么出错
declare @aa int
set @aa=9
select top @aa a.title as title,b.name as typename,
a.publishdate as publishdate,a.replytimes as replytimes
from diary a
inner join diarytype b on a.typeid=b.id
where a.userid=0
order by a.publishdate desc

提示：
Msg 102, Level 15, State 1, Line 3
Incorrect syntax near 'aa '.

如果把@aa换为1就可以了

[解决办法]
top 不支持这样的写法，把要执行的语句拼成字符串，用EXEC来执行。

参考：
http://www.cnblogs.com/happyhippy/archive/2007/01/29/633119.aspx
[解决办法]
declare @aa int
declare @sql varchar(500)
set @aa=9
set @sql= 'select top '+@aa+ ' a.title as title,b.name as typename,a.publishdate as publishdate,a.replytimes as replytimes from diary a inner join diarytype b on a.typeid=b.id where a.userid=0 order by a.publishdate desc '
exec @sql
[解决办法]
declare @aa int
set @aa=9
select top(@aa) a.title as title,b.name as typename,
a.publishdate as publishdate,a.replytimes as replytimes
from diary a
inner join diarytype b on a.typeid=b.id
where a.userid=0
order by a.publishdate desc
-----------------------------
不过要SQL2005