Complicated MySQL Query Problem - mysql

Question

I have a problem with a MySQL Query:
I have two tables:
- clustercategories
- domains
Now I have a SQL Query which lists all Domains of a specific category with category name - this is my Query:
SELECT domains.*, clustercategories.clustercategoryname
FROM (domains, clustercategories)
WHERE ((clustercategories.id = 3 AND (domains.cluster1id = 3 OR domains.cluster2id = 3))
OR (clustercategories.id = 10 AND (domains.cluster1id = 10 OR domains.cluster2id = 10)))
AND domains.status = '1'
GROUP BY domains.name
ORDER BY domains.name
The Problem is now, that I also have a third table "subpages" where I want to count all entries of a specific domain with status = '1' and I don't know how to modify my query to work - I have tried this query, but I do not get any results:
SELECT domains.*, clustercategories.clustercategoryname
FROM (domains, clustercategories)
WHERE ((clustercategories.id = 3 AND (domains.cluster1id = 3 OR domains.cluster2id = 3) AND (SELECT COUNT(*) AS total FROM subpages WHERE subpages.domainid = domains.id AND subpages.status = '1'))
OR (clustercategories.id = 10 AND (domains.cluster1id = 10 OR domains.cluster2id = 10) AND (SELECT COUNT(*) AS total FROM subpages WHERE subpages.domainid = domains.id AND subpages.status = '1')))
AND domains.status = '1'
GROUP BY domains.name
ORDER BY domains.name
Has anyone any ideas?

Answer 1

I think that you'll want to put your subquery into your projection, like this:
SELECT domains.*, clustercategories.clustercategoryname,
(SELECT COUNT(*) FROM subpages WHERE subpages.domainid = domains.id AND subpages.status = '1') AS total
FROM domains, clustercategories
WHERE ((clustercategories.id = 3 AND (domains.cluster1id = 3 OR domains.cluster2id = 3))
OR (clustercategories.id = 10 AND (domains.cluster1id = 10 OR domains.cluster2id = 10)))
AND domains.status = '1'
GROUP BY domains.name
ORDER BY domains.name

Answer 2

It looks to me your first query can be rewritten like this
SELECT d.*
, cc.clustercategoryname
FROM domains d
INNER JOIN clustercategories cc
ON cc.id = d.cluster1id
OR cc.id = d.cluster2id
WHERE cc.id IN (3, 10)
AND d.status = '1'
GROUP BY
d.name
ORDER BY
d.name
thus adding the count of subpages can be done like this
SELECT d.*
, cc.clustercategoryname
, sp.total
FROM domains d
INNER JOIN clustercategories cc
ON cc.id = d.cluster1id
OR cc.id = d.cluster2id
LEFT OUTER JOIN (
SELECT COUNT(*) AS total
, domainid
FROM subpages
WHERE subpages.status = '1'
GROUP BY
domainid
) sp ON sp.domainid = d.domainid
WHERE cc.id IN (3, 10)
AND d.status = '1'
GROUP BY
d.name
ORDER BY
d.name