What does EXPLAIN show?
What proportion of contacts have owner_id=7 and user_id is null?
If it's a large number of contacts, I'd try the following:
create temporary table tusers as
select coalesce(p.ref_contact_id,e.ref_contact_id) as id, u.id as user_id
from my_users u
left join phone_number p on on p.significant=u.phone_significant
from my_users u
left join phone_number p on on p.significant=u.phone_significant
left join email_addresses e on e.email=u.email
where p.ref_contact_id is not null or e.ref_contact_id is not null;
create unique index tusers_idx on tusers(id);
update contacts set user_id=t.user_id
from tusers t
If it's a small number of contacts, then it might be worth creating a temporary table of that subset, indexing it, then replacing "where p.ref_contact_id is not null or e.ref_contact_id is not null" with "where p.ref_contact_id in (select id from TEMPTABLE) or e.ref_contact_id in (select id from TEMPTABLE)"
Calvin Dodge
On Sat, Aug 17, 2013 at 3:19 PM, Robert DiFalco <robert.difalco@xxxxxxxxx> wrote:
Currently I run two queries back-to-back to correlate users with contacts.UPDATE contacts SET user_id = u.idFROM my_users uJOIN phone_numbers pn ON u.phone_significant = pn.significantWHERE contacts.owner_id = 7 AND contacts.user_id IS NULL AND contacts.id = pn.ref_contact_id;UPDATE contacts SET user_id = u.idFROM my_users uJOIN email_addresses em ON u.email = em.emailWHERE contacts.owner_id = 7 AND contacts.user_id IS NULL AND contacts.id = em.ref_contact_id;For some reason I cannot figure out how to combine these into one update query. They are running slower than I'd like them to even though I have indices on user_id, owner_id, email, and significant. So I'd like to try them in a single query to see if that helps.As always, thanks for your sage advice.