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POA Better way to optimize these MySQL queries
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copied!<p>I have two MySQL tables:</p> <ul> <li>attributes (attributeid, name)</li> <li>productsattributes (productid, attributeid, displayvalue)</li> </ul> <p>The required is for each attribute name called "Product Type" get all other attributes associated with this "Product Type". As an example — attributes table will look like:</p> <pre><code> attributeid name 1 A 2 B 3 Product Type 4 D </code></pre> <p>productsattributes table will look like:</p> <pre><code>productid attributeid displayvalue 1 3 FAN 1 1 Brown 1 2 Stand 2 3 FAN 2 4 D 3 3 CAR 3 4 imported </code></pre> <p>So the final result should be:</p> <pre><code>FAN (A,B, Product Type,D) CAR (Product Type, imported) </code></pre> <p>Here is my try:</p> <ul> <li>first I get all the "displayvalues" from productattributes:</li> </ul> <pre class="lang-sql prettyprint-override"><code>SELECT DISTINCT displayvalue FROM productsttributes WHERE attributeid = 3; </code></pre> <ul> <li>then I loop through each "displayvalues" to find the other attributes:</li> </ul> <pre class="lang-sql prettyprint-override"><code>SELECT a.name FROM attributes a INNER JOIN productsattributes pa ON pa.attributeid = a.attributeid AND productid in ( SELECT productid FROM productsttributes WHERE dispalyvale = '$displayvalue') ORDER BY a.name; </code></pre> <p>The problem is the productattributes table has about 7 million rows, so my script is taking forever .. of course I am not looking for 10 minutes solution but at least it will improve my queries a bit.</p>

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