限制返回的结果数量

Question

如何限制返回的结果数量？

$images = $wpdb->get_col("
    SELECT ID FROM $wpdb->posts
    WHERE post_type = 'attachment'
    AND ID in ($meta)
    ORDER BY menu_order ASC
");

Answer 1

要限制为5行，请使用以下查询：

$images = $wpdb->get_col("
    SELECT ID FROM $wpdb->posts
    WHERE post_type = 'attachment'
    AND ID in ($meta)
    ORDER BY menu_order ASC
    LIMIT 5
");