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    <pre><code>FROM suppliers c INNER JOIN supplier_site ss ON c.supplier_id = ss.supplier_id WHERE c.supplier_id != '0' AND ss.site_id = '2' GROUP BY c.supplier_id ORDER BY c.supplier_name ASC </code></pre> <p>Since autogenerated primary keys are never equal to 0 (unless big db design mistake) you can drop the c.supplier_id != '0' clause.</p> <p>ss.site_id = '2' should be in the JOIN condition for readability.</p> <p>It looks like this should match only one row in table supplier_site per supplier (if this is your usual 1-N thing-addresses relation, ie you're selecting the second address of each supplier, maybe '2' corresponds to 'billing address' or something) so the GROUP BY c.supplier_id is useless. If the GROUP BY actually does something, then the query is wrong, since the "address" columns, which presumably come from supplier_site table, would come from a random row.</p> <p>So here's the simplified FROM (the WHERE is gone) :</p> <pre><code>FROM suppliers c INNER JOIN supplier_site ss ON (c.supplier_id = ss.supplier_id AND ss.site_id = '2') ORDER BY c.supplier_name ASC </code></pre> <p>I suppose you got an index on c.supplier_name so this part of the query should be very fast.</p> <p>Now try this query :</p> <pre><code>SELECT a.*, questapproved, ss.supplier_no AS supplier_no, IF (active=1,'Yes', IF (active=2, 'NCR Only','Inactive')) AS rated, sum( q.incomplete = '0') AS questions, sum( q.reviewed = '1' ) AS reviewed FROM ( SELECT c.supplier_id, supplier_name, address1, address2, address3, address4, suppliertype, postcode, contact_name FROM suppliers c INNER JOIN supplier_site ss ON (c.supplier_id = ss.supplier_id AND ss.site_id = '2') ORDER BY c.supplier_name ASC LIMIT 0, 20 ) a LEFT JOIN supplier_questions q ON (q.supplier_id = c.supplier_id) GROUP BY c.supplier_id ORDER BY c.supplier_name; </code></pre>
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    1. COGenerated a number of SQL errors, after moving questapprove, supplier_no and rated into the FROM query it complains avout c.supplier_id is an unknown column in ON clause
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    2. COGot your query working and it is a lot faster however can't order by questions as it doesn't order for some reason
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