How should I merge these selects and narrow the result set? - mysql

Question

I have this huge query that filters results out of a series of keywords.
select distinct textures.id from textures
WHERE ((textures.id in (
select tt.texture_id
from tag_texture tt join tags t
on t.id = tt.tag_id
where t.name in ('tag1', 'tag2')
group by tt.texture_id
HAVING COUNT(DISTINCT t.id) = 2
)
) OR (textures.id in (
select ct.texture_id
from category_texture ct join categories c
on c.id = ct.category_id
where c.name in ('category1', 'category2')
group by ct.texture_id
HAVING COUNT(DISTINCT c.id) = 2
)
) OR (textures.id in (
select tex.id
from textures tex
where tex.name LIKE 'texturename'
group by tex.id
HAVING COUNT(DISTINCT tex.id) = 1
)
) ) AND textures.is_published = 1
The problem is that if I search for texturename tag1, all texturename results will be found, even if they have nothing to do with tags. However, if I search for "tag1 tag2", the resulting list is filtered out (less results than just searching tag1). Changing those ORs to AND widens the results even more, obviously.
What's the best way to merge these results so that each time a word is filtered the result set is narrowed down?

Answer 1

Changing all the OR to AND should solve the problem:
SELECT id, name
FROM textures
WHERE ((textures.id in (
select tt.texture_id
from tag_texture tt join tags t
on t.id = tt.tag_id
where t.name in ('1k', 'test')
group by tt.texture_id
HAVING COUNT(DISTINCT t.id) = 2
)
) AND (textures.id in (
select ct.texture_id
from category_texture ct join categories c
on c.id = ct.category_id
where c.name in ('mine')
group by ct.texture_id
HAVING COUNT(DISTINCT c.id) = 1
)
) AND (textures.id in (
select tex.id
from textures tex
where tex.name LIKE '%apple%'
group by tex.id
HAVING COUNT(DISTINCT tex.id) = 1
)
) ) AND textures.is_published = 1
SqlFiddle
There's no need to use DISTINCT in this query. You're not joining with any other tables, so nothing is going to cause the results to multiply.
If you want to search for the same keywords in all the fields, and require that at least one of them match each field, get rid of the GROUP BY and HAVING clauses.
select textures.id, textures.name from textures
WHERE ((textures.id in (
select tt.texture_id
from tag_texture tt join tags t
on t.id = tt.tag_id
where t.name in ('1k', 'test', 'apple', 'mine')
)
) AND (textures.id in (
select ct.texture_id
from category_texture ct join categories c
on c.id = ct.category_id
where c.name in ('1k' 'test', 'apple', 'mine')
)
) AND (textures.id in (
select tex.id
from textures tex
where tex.name LIKE '%1k%' OR tex.name LIKE '%test%' OR tex.name LIKE '%apple%'
OR tex.name LIKE '%mine%'
)
) ) AND textures.is_published = 1
I added mine to the list of keywords, because otherwise there was no match in the categories table.
SqlFiddle