mysql in 有关问题

mysql in 问题
数据库里有如下数据:

person表
id name 
1 zhangsan
2 lisi

SQL code

select * from person where id in (1,2,2,2,2);

以上查询只能得到 1，2的数据，如下
id name 
1 zhangsan
2 lisi
我想得到重复的2的数据，如下，该怎么做啊谢谢
id name 
1 zhangsan
2 lisi
2 lisi
2 lisi
2 lisi

------解决方案--------------------
select * from person where id =1
union all
select * from person where id =2
union all
select * from person where id =2
union all
select * from person where id =2
union all
select * from person where id =2