Mysql父记录在子表中有多个记录显示在一列中

I have two table

1. user (user_name,user_id)
   
2. servies (service_id, service_name, user_id)
   

One each user have manay servics e.g
user "john" have many record in servies as PHP, HTML, SEO

I want to show each user services as follow

user_name ---------------servies  
john --------------------PHP, HTML,SEO  
Miky --------------------Java, C# , Objective C  

I want select query of this results

SELECT user_name,GROUP_CONCAT(service_name) FROM user 
JOIN servies
ON user.user_id=servies.user_id
GROUP BY user_name