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  1. PO
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    <p>Your Query is F*ed up.. You have <code>GROUP BY cl.advertiser_id</code> but also <code>ORDER BY cl.timestamp</code> DESC timestamp is not in the <code>Group BY</code> This shouldn't be allowed!</p> <p>Why do you have a <code>Group BY</code> at All!! Take it out. Remove your <code>force index.</code> Then fix your code so it doesn't have any dups, that is not what group by is for.</p> <p>Edit: Try</p> <pre><code>SELECT cl.title, cl.URL, cl.ID AS ad_id, cl.cat_id, cl.price, cl.timestamp cs.name AS cat_name, pix.file_name, area.area_name FROM findix.classifieds cl INNER JOIN findix.classifieds_pix pix ON cl.ID = pix.classified_id INNER JOIN findix.cat_names_sub cs ON cl.cat_id = cs.ID INNER JOIN findix.zip_codes zip ON cl.zip_id = zip.zip_id INNER JOIN findix.area_names area ON zip.area_id = area.id WHERE cl.confirmed = 1 AND cl.price != '' AND cl.country = 'de' ORDER BY cl.timestamp DESC </code></pre> <p>or </p> <pre><code>SELECT cl.advertiser_id,cl.title, cl.URL, cl.ID AS ad_id, cl.cat_id, cl.price, cl.timestamp max(cs.name) AS cat_name, max(pix.file_name) as file_name, max(area.area_name) as area.area_name FROM findix.classifieds cl INNER JOIN findix.classifieds_pix pix ON cl.ID = pix.classified_id INNER JOIN findix.cat_names_sub cs ON cl.cat_id = cs.ID INNER JOIN findix.zip_codes zip ON cl.zip_id = zip.zip_id INNER JOIN findix.area_names area ON zip.area_id = area.id WHERE cl.confirmed = 1 AND cl.price != '' AND cl.country = 'de' Group By cl.advertiser_id,cl.title, cl.URL, cl.ID AS ad_id, cl.cat_id, cl.price, cl.timestamp ORDER BY cl.timestamp DESC </code></pre>
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    1. POSlow SQL query because of ORDER BY not using index
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    1. COThe `GROUP BY` is supposed to select only one classified per advertiser - is this the wrong approach to do this?
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    2. COId there are 4 diffident values in the subtables how does the query know which one to take? (See my edit).
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    3. COYour 1st query runs pretty slow (.7 secs). EXPLAIN says `Using temporary; Using filesort`. The second one takes 1 sec, and also uses a temporary table and filesort.
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