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POHow to select two random rows with same category in MySQL
 

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  1. POHow to select two random rows with same category in MySQL
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    <p>I am beginner in javascript and nodejs, and not having much knowledge of mysql. These are the column names of my MySQL table whose name is <code>cars</code>:</p> <ul> <li>Name</li> <li>model</li> <li>TransmissionType</li> <li>EngineSize</li> <li>VehicleSize</li> <li>BodyType</li> </ul> <p>I want to randomly select <code>Name</code> and <code>model</code> from <code>cars</code>, but the category must match which will be decided by the other four coloumns: <code>TransmissionType</code>, <code>EngineSize</code>, <code>VehicleSize</code> and <code>Body Type</code>, in such a way that randomly selected cars must share same values for <code>engine</code>, <code>TransmissionType</code>, <code>VehicheSize</code> and <code>BodyType</code>. Output should be in two rows only.</p> <p>Engine size has values: <code>3.2, 3.5, 1.6, 5.2, 2.0, 2.2</code></p> <p>TransmissionType has values: <code>Manual</code> and <code>Automatic</code></p> <p>VehicleSize has values: <code>Compact</code>, <code>MidSize</code> and <code>Large</code>.</p> <p>BodyType has values: <code>Car</code>, <code>van</code> and <code>truck</code>.</p> <p>What query should I write to achieve this? Please help. </p> <p>I did this, and the query is working fine, but there are too many sub-queries are running in it, is it possible to achieve this using not more den 2-3 sub-queries? </p> <pre><code>SELECT Name, model FROM cars WHERE EngineSize IN (SELECT * FROM (SELECT EngineSize FROM cars ORDER BY RAND( ) LIMIT 1 ) AS A) AND TransmissionType IN (SELECT * FROM (SELECT TransmissionType FROM cars ORDER BY RAND( ) LIMIT 1 ) AS B) AND BodyType IN (SELECT * FROM (SELECT BodyType FROM cars ORDER BY RAND( ) LIMIT 1 ) AS C) AND VehicleSize IN (SELECT * FROM (SELECT VehicleSize` FROM cars ORDER BY RAND( ) LIMIT 1 ) AS D) LIMIT 2 </code></pre>
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