sqlserver查询某一字段重复超5次的所有记录

用的sqlserver2008 r2。

SELECT

 *

FROM t_class

WHERE id IN (SELECT

 id

FROM (SELECT

 ROW_NUMBER() OVER (PARTITION BY id ORDER BY inserttime) AS rn,

 id

FROM t_class) myclass

WHERE rn >= 5) ORDER BY id;

看起来好复杂，不知道有没有简单方法。