wp query - how to show posts that are missing a meta_value

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How can I build a query to find posts that DO NOT contain a certain meta key or meta value?

for example:

query_posts( array( 
    'meta_query' => array(
        array( 'key' => 'feature', 'value' => '_wp_zero_value', 'compare' => '!=' )         )
) );

How can I build a query to find posts that DO NOT contain a certain meta key or meta value?

for example:

query_posts( array( 
    'meta_query' => array(
        array( 'key' => 'feature', 'value' => '_wp_zero_value', 'compare' => '!=' )         )
) );

• wp-query
• meta-query

Share Improve this question edited Jun 28, 2011 at 23:56 TheDeadMedic 36.7k99 gold badges6868 silver badges102102 bronze badges asked Jun 28, 2011 at 23:54 dwenausdwenaus 1,25122 gold badges1313 silver badges2424 bronze badges

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2 Answers 2

Sorted by: Reset to default 9

Getting posts without a certain meta key is a little tricky, namely due to the database design and the nature of SQL joins.

AFAIK, the most efficient way would be to actually grab the post IDs that do have the meta key, and then exclude them from your query.

// get all post IDs that *have* 'meta_key' with a non-empty value
$posts = $wpdb->get_col( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = 'my_key' AND meta_value != ''" );

// get all posts *excluding* the ones we just found
query_posts( array( 'post__not_in' => $posts ) );

$args = array(
    'meta_query' => array(
        'relation' => 'OR', //default AND
        array(
            'key' => 'feature',
            'compare' => 'NOT EXISTS'
        ),
        array(
            'key' => 'feature',
            'value' => '_wp_zero_value',
            'compare' => '='
        )
    ));

$the_query = new WP_Query($args);
var_dump($the_query);

Read further : Wordpress Doc

NB: before the wordpress 3.9 there is a bug So this is the work around

array(
       'key' => 'feature',
       'compare' => 'NOT EXISTS',
       'value' => '' //add this empty value check for check NOT EXISTS
      ),

本文标签： wp queryhow to show posts that are missing a metavalue