PHP CodeIgniter多个LEFT OUTER在查询中加入

Question

我正在使用php CodeIgniter从我的数据库中查询。我需要使用多个LEFT OUTER联接。联接使用多个条件（从错误开始，我不确定它是否受支持）。我要获取的两个参数的查询结果具有相同的值：

查询：

$this->db->select('anonymous.*,
    count(items_likes.id) as all_likes, count(items_comments.id) as all_comments');
    $this->db->from('anonymous');
    $this->db->where('anonymous.fid', $feed_id);

    $this->db->group_by('anonymous.id');

    $this->db->join('all_users', 'all_users.id = anonymous.uid', 'left outer');
    $this->db->join('images', 'images.ud = anonymous.uid AND images.fid = anonymous.fid', 'left outer');
    $this->db->join('items_likes', 'items_likes.uid = anonymous.uid AND items_likes.fid = anonymous.fid', 'left outer');

    $this->db->join('items_comments', 'items_comments.uid = anonymous.uid AND items_comments.fid = anonymous.fid', 'left outer');

    $list = $this->db->get()->result();

匿名：是具有未注册用户的表

fid：是提要ID

图像：是上载到提要中的所有图像的表

items_likes：每张图片的所有用户赞数

item_comments：是每个图像的所有用户评论

问题在于，all_comments始终以all_likes的形式返回same值。我不确定是多个LEFT-OUTER联接是问题还是我在每个联接语句中都使用多个条件的事实，即

items_comments.uid =匿名.uid和items_comments.fid =匿名.fid

日志结果：

"all_likes":"12","all_comments":"12"

尽管我有12个赞，但评论应为3

如果我按如下方式编写查询，则结果正常：

$this->db->select('anonymous.*,
(SELECT count( items_likes.id ) FROM items_likes WHERE items_likes.uid = anonymous.uid AND items_likes.fid = anonymous.fid) as all_likes, 
(SELECT count( items_comments.id ) FROM items_comments WHERE items_comments.uid = anonymous.uid AND items_comments.fid = anonymous.fid) as all_comments');
$this->db->from('anonymous');
$this->db->where('anonymous.fid', $feed_id);

$this->db->group_by('anonymous.id');

$this->db->join('all_users', 'all_users.id = anonymous.uid', 'left outer');
$this->db->join('images', 'images.ud = anonymous.uid AND images.fid = anonymous.fid', 'left outer');
//$this->db->join('items_likes', 'items_likes.uid = anonymous.uid AND items_likes.fid = anonymous.fid', 'left outer');

//$this->db->join('items_comments', 'items_comments.uid = anonymous.uid AND items_comments.fid = anonymous.fid', 'left outer');

$list = $this->db->get()->result();