mysql 一表字段逗号分隔对应另一表字段查询

表一：login

id	cids	state
1	1,2	1

表二：learn

id	name
1	zhangsan
2	lisi
3	wangwu

select g.id, GROUP_CONCAT(s.name) as sname from login g left join tlearn s on FIND_IN_SET(s.id, g.cids) GROUP BY g.id