MySQL Query Returning Empty - mysql

Question

I have 2 tables - posts and postmeta.
posts
ID title category post_status post_type
1 ABC cat-1 Publish Store
2 DEF cat-2 Publish Store
3 GHI cat-3 Publish Store
4 JKL cat-2 Publish Store
5 XYZ cat-5 Draft Store
6 MNO cat-9 Publish Article
and
postmeta
meta_id post_id meta_key meta_value
109 1 city 1
110 1 featured h
111 2 city 1,2
112 2 featured both
113 3 city 2,3
114 3 featured both
115 4 city 1
116 4 featured n
117 5 city 1,4
118 5 featured h
119 6 city 1
120 6 featured h
I am trying to run a query that would give me a list of posts which has the following conditions:
Whose value against city has 1 AND
whose value for featured is either h or both AND
whose post status is Publish AND
whose post type is Store
Order them by title
The query I am trying is
SELECT DISTINCT posts.ID , posts.*, postmeta.*
FROM posts, postmeta
WHERE posts.ID = postmeta.post_id
AND (postmeta.meta_value = 'h' OR postmeta.meta_value = 'both')
AND (postmeta.meta_key = 'post_city_id' AND (postmeta.meta_value LIKE '%,1,%' OR postmeta.meta_value LIKE '%1,%' OR postmeta.meta_value LIKE '%,1%' OR postmeta.meta_value LIKE '%1%'))
AND posts.post_status = 'Publish'
AND posts.post_type = 'Store'
ORDER BY (SELECT postmeta.meta_value from postmeta where (posts.ID = postmeta.post_id) and postmeta.meta_key LIKE '%home_featured_type%') asc, posts.post_title LIMIT 0,6
The correct returns would be IDs 1 and 2 i.e. abc and def. But I am getting empty result. I cannot figure out where it is falling apart. How can this be fixed?

Answer 1

here is a fixed query, but I still don't understand the mysterious ORDER BY (SELECT) thingie.
http://sqlfiddle.com/#!2/5ce5a/19
SELECT DISTINCT posts.ID , posts.*, postmeta_city.*, postmeta_featured.*
FROM posts
INNER JOIN postmeta AS postmeta_city
ON postmeta_city.post_id = posts.ID
AND postmeta_city.meta_key = 'city'
AND ( postmeta_city.meta_value LIKE '%,1,%'
OR postmeta_city.meta_value LIKE '%1,%'
OR postmeta_city.meta_value LIKE '%,1%'
OR postmeta_city.meta_value LIKE '%1%'
)
INNER JOIN postmeta AS postmeta_featured
ON postmeta_featured.post_id = posts.ID
AND postmeta_featured.meta_key = 'featured'
AND ( postmeta_featured.meta_value = 'h'
OR postmeta_featured.meta_value = 'both'
)
WHERE posts.post_status = 'Publish'
AND posts.post_type = 'Store'
ORDER BY (
SELECT postmeta.meta_value
FROM postmeta
WHERE ( posts.ID = postmeta.post_id )
AND postmeta.meta_key LIKE '%home_featured_type%'
) asc,
posts.title
LIMIT 0,6;
;
Updated with other people's ideas, please upvote them:
http://sqlfiddle.com/#!2/5ce5a/33
SELECT DISTINCT posts.ID , posts.*, postmeta_city.*, postmeta_featured.*
FROM posts
INNER JOIN postmeta AS postmeta_city
ON postmeta_city.post_id = posts.ID
AND postmeta_city.meta_key = 'city'
AND FIND_IN_SET('1', postmeta_city.meta_value)
INNER JOIN postmeta AS postmeta_featured
ON postmeta_featured.post_id = posts.ID
AND postmeta_featured.meta_key = 'featured'
AND postmeta_featured.meta_value IN ('h','both')
WHERE posts.post_status = 'Publish'
AND posts.post_type = 'Store'
ORDER BY (
SELECT postmeta.meta_value
FROM postmeta
WHERE ( posts.ID = postmeta.post_id )
AND postmeta.meta_key LIKE '%home_featured_type%'
) asc,
posts.title
LIMIT 0,6;
;

Answer 2

You're getting an empty result set because you are ANDing the meta_value column so it has to equal two values at the same time which is impossible. Something like val = '1' AND val = 'both' will always return false and none of the rows would join. Instead, you must use an OR between conditions: city -> 1 and featured -> h/both.
Since the post must contain both city -> 1 and featured -> h/both (which are not across columns but across multiple rows), you'll need a HAVING clause in conjunction with a GROUP BY to ensure each post joins with two rows, satisfying both conditions... not one or the other.
Also, that is an awful lot of LIKE's to check for the existance of a 1. You can use FIND_IN_SET instead:
SELECT
*
FROM
posts a
INNER JOIN
postmeta b ON a.ID = b.post_id
AND
(
(b.meta_key = 'city' AND FIND_IN_SET('1', b.meta_value) > 0)
OR
(b.meta_key = 'featured' AND b.meta_value IN ('h', 'both'))
)
WHERE
a.post_status = 'Publish'
AND a.post_type = 'Store'
GROUP BY
a.ID
HAVING
COUNT(*) = 2
ORDER BY
a.title

Answer 3

Try this :
SELECT DISTINCT posts.ID , posts.*, postmeta.*
FROM posts AS p INNER JOIN postmeta AS pm
WHERE p.ID = pm.post_id
AND (pm.meta_value in ('h','both')
AND (pm.meta_key = 'city' AND
(pm.meta_value LIKE '%,1,%' OR pm.meta_value LIKE '%1,%' OR pm.meta_value LIKE '%,1%' OR pm.meta_value LIKE '%1%'))
AND posts.post_status = 'Publish'
AND posts.post_type = 'Store'
ORDER BY p.title LIMIT 0,6
Since you want order by title only, so there is no need to write any query in 'order by' clause.