This is going to return duplicate rows if there are results that match
both conditions. One of the queries needs a condition to exclude the
results that'll be sent in the other query.
You can do it this way, and in some cases it's faster. But, what I
think we should really be asking is:
1)
Hi Everyone,
I'm trying to run a very simple query on two joined tables but it's taking a
long time to run.
I have two tables, users and sites, both of which have an email address field
that I'm querying.
here's my query:
SELECT *
FROM sites
INNER JOIN users ON sites.userid = users.ID
My guess is that the OR is searching the whole table for each element of the
other table. It compounds the select statement.
You may try a Union.Im new to Mysql so im not sure it will work, but you
might try it out.
SELECT *
FROM sites
INNER JOIN users ON sites.userid = users.ID
WHERE sites.email
UNION all does a cartesian join ..maxiumum number of results will be delivered
SELECT *
FROM sites
INNER JOIN sites.userid = users.ID;
-- INNER JOIN users ON sites.userid = users.ID
--ALSO put (hopefully UNIQUE indexes) on sites.userid and users.id
Martin
