Query M:N contains - sql

Question

I am trying to filter a set of tables that includes an M:N junction table in Android Room (SQLite).
An image can have many subjects. I'd like to allow filtering by a subject, so that I get a row with complete image information (including all subjects). So if an image had (National Park, Yosemite) filtering for either would result in one row with both keywords. Unless I messed something up, a typical join will result in multiple rows such that matching Yosemite would get the right image, but you'd be lacking National Park. I came up with this:
SELECT *,
(SELECT GROUP_CONCAT(name)
FROM meta_subject_junction
JOIN subject
ON subject.id = meta_subject_junction.subjectId
WHERE meta_subject_junction.metaId = meta.id) AS keywords,
(SELECT documentUri
FROM image_parent
WHERE meta.parentId = image_parent.id ) AS parentUri
FROM meta
Now this gets me the complete rows, but I think at this point I'd need to:
WHERE keywords LIKE(%YOSEMITE%)
and I think the LIKE is less than ideal, not to mention an imprecise match. Is there a better way to accomplish this? Thanks, this is bending my novice SQL brain.
Further details
meta
+----+----------+--+
| id | name | |
+----+----------+--+
| 1 | yosemite | |
| 2 | bryce | |
| 3 | flowers | |
+----+----------+--+
subject
+----+---------------+--+
| id | name | |
+----+---------------+--+
| 1 | National Park | |
| 2 | Yosemite | |
| 3 | Tulip | |
+----+---------------+--+
junction
+--------+-----------+
| metaId | subjectId |
+--------+-----------+
| 1 | 1 |
| 1 | 2 |
| 2 | 1 |
| 3 | 3 |
+--------+-----------+
Although I may have done something wrong, as far as I can tell Android Room doesn't like:
+----+-----------+---------------+
| id | name | subject |
+----+-----------+---------------+
| 1 | yosemite | National Park |
| 1 | yosemite | Yosemite |
+----+-----------+---------------+
so I'm trying to reduce the rows:
+----+-----------+-------------------------+
| id | name | subject |
+----+-----------+-------------------------+
| 1 | yosemite | National Park, Yosemite |
+----+-----------+-------------------------+
which the above query does. However, I also want to query for a subject. So that National Park filter will yield:
+----+-----------+-------------------------+
| id | name | subject |
+----+-----------+-------------------------+
| 1 | yosemite | National Park, Yosemite |
| 2 | bryce | National Park |
+----+-----------+-------------------------+
I'd like to be more precise/efficient than LIKE with the already 'concat' subject. Most of my attempts end up with no results in Room (multi-row) or reducing the subject to only the filter keyword.
Update
Here's a test I've been using to compare the actual SQL results from a query to what Android Room ends up with:
http://sqlfiddle.com/#!7/0ac11/10/0
That join query is interpreted as four objects in Android Room, so I'm trying to reduce the rows, but retain the full subject results while filtering for any image containing the subject keyword.

Answer 1

If you want multiple keywords, then where and group by and having can be used:
select image_id
from image_subject
where subject_id in ('a', 'b', 'c') -- whatever
group by image-id
having count(distinct subject_id) = 3; -- same count as in `where`

Answer 2

This gets the result I need, though I'd love to hear a better option if this is particularly inefficient.
SELECT meta.*,
(SELECT GROUP_CONCAT(name)
FROM junction
JOIN subject
ON subject.id = junction.subjectId
WHERE junction.metaId = meta.id) AS keywords,
junction.subjectId
FROM meta
LEFT JOIN junction ON junction.metaId = meta.id
WHERE subjectId IN (1,2)
GROUP BY meta.id
+----+----------+------------------------+-----------+
| id | name | keywords | subjectId |
+----+----------+------------------------+-----------+
| 1 | yosemite | National Park,Yosemite | 2 |
| 2 | bryce | National Park | 1 |
+----+----------+------------------------+-----------+
http://sqlfiddle.com/#!7/86a76/13