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$this->db->where('user_id', $user_id);
$this->db->select('star_id');
$query = $this->db->get('tbl_star_user_light');
$this->db->where('user_id', $user_id);
$this->db->or_where('parent_id',$user_id);
$this->db->select('star_id');
$query = $this->db->get('tbl_star');
取两个表格star_id的交集,返回一个数组。
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