meta value count

  • Hi,
    I have the following query:

    $journal = get_post_meta($post_id, 'Journal', $single = true);
$journal_count = $wpdb->get_var("SELECT COUNT (*)
	FROM $wpdb->postmeta WHERE meta_key = 'Journal' AND meta_value = '$journal' " );

    this returns NULL.

    I don’t understand why.

    Anybody help?

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