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    copied!<p>This is an indirect solution to get the sequence as per the requirement.</p> <p>As i was using PHP to fetch data, first i wrote an sql query to fetch the data according to priority.</p> <pre><code>SELECT `Category`.`id`, `Category`.`name`, `Category`.`priority` , `Product`.`name`, `Product`.`category_id` FROM `categories` AS `Category` INNER JOIN `products` AS `Product` WHERE `Category`.`id` = `Product`.`category_id` ORDER BY CASE WHEN `Category`.`priority` IS NULL THEN 1 ELSE 0 END ASC, `Category`.`priority` ASC; </code></pre> <p>Then i did a simple array manipulation to get an array as follow.</p> <pre><code>array( (int) 1 =&gt; array( (int) 0 =&gt; array( (int) 0 =&gt; '1', (int) 1 =&gt; '6' ), (int) 1 =&gt; array( (int) 0 =&gt; '2', (int) 1 =&gt; '7' ), (int) 2 =&gt; array( (int) 0 =&gt; '3', (int) 1 =&gt; '8' ), (int) 3 =&gt; array( (int) 0 =&gt; '4' ), (int) 4 =&gt; array( (int) 0 =&gt; '5' ), ), (int) 2 =&gt; array( (int) 0 =&gt; array( (int) 0 =&gt; '9' ), (int) 1 =&gt; array( (int) 0 =&gt; '10' ), (int) 2 =&gt; array( (int) 0 =&gt; '11' ), ), '' =&gt; array( (int) 0 =&gt; array( (int) 0 =&gt; '12' ), (int) 1 =&gt; array( (int) 0 =&gt; '13' ) ) ) </code></pre> <p>for series c1p1, c2p1, c1p2, c2p2, c1p3, c2p3, c1p4, c1p5, c3p1, c3p2, c3p3, c4p1, c4p2. Where array keys are priority and leaf values are product ids.</p> <p>Then i make a string of ids from the above array as follows.</p> <pre><code> 1,6,2,7,3,8,4,5,9,10,11,12,13 </code></pre> <p>And finally wrote the query as follows.</p> <pre><code> SELECT * FROM `products` WHERE `id` IN ( 1, 6, 2, 7, 3, 8, 4, 5, 9, 10, 11, 12, 13 ) ORDER BY FIELD( id, 1, 6, 2, 7, 3, 8, 4, 5, 9, 10, 11, 12, 13 ); </code></pre>
 

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