In my rails app, I am running a sql query using find_by_sql() since I need subqueries. This works if I do either the first or second query but when I add them together with the AND, it starts complaining about more than 1 row in subquery.
I want all rows (records) returned that match the criteria. What needs to be fixed/changes here? What is telling mysql I only want 1 row?
Here is the resultant SQL as viewed in the rails log:
Mysql::Error: Subquery returns more than 1 row: select p.* from policies p
where exists (select 0 from status_changes sc join statuses s on sc.status_id = s.id
where sc.policy_id = p.id
and s.status_category_id = '1'
and sc.created_at between '2009-03-10' and '2009-03-12')
or exists
(select 0 from status_changes sc join statuses s on sc.status_id = s.id
where sc.created_at in
(select max(sc2.created_at)
from status_changes sc2
where sc2.policy_id = p.id
and sc2.created_at < '2009-03-10')
and s.status_category_id = '1'
and sc.policy_id = p.id)
AND (select 0 from status_changes sc
where sc.policy_id = p.id
and sc.status_id = 7
and sc.created_at between '2008-12-31' and '2009-03-12')
or exists
(select 0 from status_changes sc
where sc.created_at in
(select max(sc2.created_at)
from status_changes sc2
where sc2.policy_id = p.id
and sc2.created_at < '2008-12-31')
and sc.status_id = 7
and sc.policy_id = p.id)