php - Retrieve unique results from JOIN query

I have two tables, one is 'posts' the other is 'images'

posts table

id | article |

 1    |   post 1    |  
 2    |   post 2    |    
 3    |   post 3    |  

images table

project_id | image_name|

 1            |   img1    |  
 1            |   img2    |    
 2            |   img3    | 
 2            |   img4    |  
 3            |   img5    |  

 3            |   img6    |  

My current query is this:

SELECT  * FROM `images`  RIGHT   JOIN `posts` ON images.project_id = posts.id 

But it is showing multiple results from the posts table.

I want the results like this, to avoid multiple results.

post 1 - img1
post 2 - img3
post 3 - img5

Answer

SELECT  
  p.article, i.image_name 
FROM 

  `posts` p
JOIN (
  select
    i2.project_id, min(i2.image_name) as image_name
  from
    images i2 
  group by
    i2.project_id
) i
 on i.project_id=p.id