Retrieve unique results from JOIN query - php

Question

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 1

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

Answer 2

SELECT * FROM posts RIGHT JOIN images ON posts.id = images.project_id group by posts.id
Use group by Clasue to get unique result.

Answer 3

This will do exactly what you asked for.
SELECT `posts`.id, `posts`.`article`,`images`.`image_name` FROM `posts` INNER JOIN `images` ON `posts`.`id` = `images`.`project_id` GROUP BY id
Check this out.
MariaDB [fbb]> SELECT * FROM `posts`;
+----+---------+
| id | article |
+----+---------+
| 1 | post1 |
| 2 | post2 |
| 3 | post3 |
+----+---------+
3 rows in set (0.00 sec)
MariaDB [fbb]> SELECT * FROM `images`;
+------------+------------+
| project_id | image_name |
+------------+------------+
| 1 | img1 |
| 1 | img2 |
| 2 | img3 |
| 2 | img4 |
| 3 | img5 |
| 3 | img6 |
+------------+------------+
6 rows in set (0.00 sec)
MariaDB [fbb]> SELECT `posts`.id, `posts`.`article`,`images`.`image_name` FROM `posts` INNER JOIN `images` ON `posts`.`id` = `images`.`project_id` GROUP BY id
-> ;
+----+---------+------------+
| id | article | image_name |
+----+---------+------------+
| 1 | post1 | img1 |
| 2 | post2 | img3 |
| 3 | post3 | img5 |
+----+---------+------------+
3 rows in set (0.00 sec)
MariaDB [fbb]>