用标准sql的with实现递归查询（sql2005以上肯定支持，sql2000不清楚是否支持）：
with subqry(id,name,pid) as (
select id,name,pid from test1 where id = 5 --指定id
union all
select test1.id,test1.name,test1.pid from test1,subqry where test1.pid = subqry.id
)
select* from subqry;
原文：http://www.cnblogs.com/firstdream/p/5333309.html