I am doing the next inside a custom function:

    $exists = $wpdb->query($wpdb->prepare('
    SELECT COUNT(*)
    FROM wp_%d_gdsr_data_article
    WHERE post_id = %d

', $blog_id, $post_id));

$is available examines to at least one even when no rows are came back through the query. Also, var_dump($wpdb->queries) yields a NULL. Anybody know what's going on here?

thanks,

Use $wpdb->get_var($query) rather.

Accordingly, use $wpdb->get_row() to retrieve just one row like a single object (or array), and $wpdb->get_results() to obtain a result set.

In the documentation:

The function returns an integer akin to the amount of rows affected/selected. If there's a MySQL error, the function will return FALSE. (Note: since both and FALSE could be came back, make certain you apply the correct comparison operator: equality == versus. identicality ===).

The query returns 1 row therefore the query() function returns 1 - and can always return 1 for that query that you simply publish inside your question, even when the amount of rows selected through the COUNT is . Use get_var, get_row, or get_results as recommended by TheDeadMedic to obtain the actual consequence of the query, which can be 0, 1, 2, etc.