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    <p>Try this one with <code>WP_Query</code> no need of relation just use the compare part with <code>IN</code></p> <pre><code> $user_ids = array(60, 61, 62, 63); $args = array( 'post_type' =&gt; 'post', 'meta_key' =&gt; 'likes', 'post_status' =&gt; 'publish', 'posts_per_page' =&gt; -1, 'orderby' =&gt; 'rand', 'order' =&gt; 'ASC', 'meta_query' =&gt; array( array( 'key' =&gt; 'likes', 'value' =&gt; $user_ids, //array 'compare' =&gt; 'IN', ) ) ); $query = new WP_Query($args); </code></pre> <blockquote> <p>See the given example above "Time Parameters" Heading <a href="http://codex.wordpress.org/Class_Reference/WP_Query" rel="noreferrer"><strong>WP_Query</strong></a></p> </blockquote> <p>OR by get_posts try this </p> <pre><code>$args = array( 'post_type' =&gt; 'post', 'post_status' =&gt; 'publish', 'posts_per_page' =&gt; -1, 'orderby' =&gt; 'rand', 'meta_query' =&gt; array( array( 'key' =&gt; 'likes', 'value' =&gt; $user_ids, 'compare' =&gt; 'IN' ) ) ); $posts = get_posts($args); </code></pre> <p>OR by a custom query you can do as follows</p> <pre><code>global $wpdb; $liked_posts=$wpdb-&gt;get_results("SELECT * FROM `wp_posts` WHERE post_type='post' AND post_status ='publish' AND ID IN( SELECT post_id FROM `wp_postmeta` WHERE meta_key='likes' AND meta_value IN (".join(',',$user_ids).") ) ORDER BY RAND()"); </code></pre> <p>Also don't store array of ids in one row instead loop through ids array and <strong>normalize</strong> your likes data manually Don't serialize data into a database field. That's what <a href="http://en.wikipedia.org/wiki/Database_normalization" rel="noreferrer"><strong>Database_normalization</strong></a> is for and insert each id in new row because </p> <blockquote> <p>Wordpress stores the meta values as strings. When you pass <code>update_post_meta</code> an array, it automatically converts it to a string. What you'll need to do is <code>unserialize</code> it when you attempt to read the data but in mysql you can't <code>unserialize</code> column data in the query because mysql doesn't about the serialization of php </p> </blockquote> <pre><code>$likes = array(61, 62); foerach($likes as $l){ update_post_meta($post-&gt;ID, "likes", $l); } </code></pre> <p>And below is the query you have asked for in bounty comments </p> <blockquote> <p><strong><em>If a $wpdb answer is given, then please elaborate on how to factor in category (include and exclude), and ignore posts by an array of IDs</em></strong></p> </blockquote> <pre><code>$liked_posts=$wpdb-&gt;get_results(" SELECT * FROM `wp_posts` wp INNER JOIN `wp_term_relationships` wtr ON (wp.`ID`=wtr.`object_id`) INNER JOIN `wp_term_taxonomy` wtt ON (wtr.`term_taxonomy_id` =wtt.`term_taxonomy_id`) WHERE wp.post_type='post' AND wp.post_status ='publish' AND wp.ID IN( SELECT post_id FROM `wp_postmeta` WHERE meta_key='likes' AND meta_value IN (".join(',',$user_ids).") ) AND wp.ID NOT IN (100,101,102) AND wtt.`term_id` IN(1,2,3) AND wtt.`term_id` NOT IN (4,5,6,) ORDER BY RAND() "); </code></pre> <p>I have used the <code>INNER JOINs</code> on <code>wp_term_relationships</code> and <code>wp_term_taxonomy</code> the table <code>wp_term_relationships</code>stores the relation of posts and the taxonomy of category and the table <code>wp_term_taxonomy</code> have the taxonomy of the category and also the category id </p> <p>Here is the part which covers the </p> <p><strong>1. category (include and exclude)</strong></p> <pre><code>AND wtt.`term_id` IN(1,2,3) AND wtt.`term_id` NOT IN (4,5,6,) </code></pre> <p><strong>2. ignore posts by an array of IDs</strong></p> <pre><code>AND wp.ID NOT IN (100,101,102) or $postids =array(100,101,102); AND wp.ID NOT IN (".join(',',$postids).") </code></pre>
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