SELECT from_id, (SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=1) AS sent_unread,
(SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=2) AS sent_read
FROM user_messages
WHERE from_id=1223
GROUP BY from_id
如何在 CodeIgniter 事件记录中编写上述 select 语句?
这是我想出的:
$this->db->select('from_id, (SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=1) AS sent_unread,
(SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=2) AS sent_read');
$this->db->where('from_id', $member_id);
$this->db->group_by('from_id');
$this->db->from('user_messages');
$result = $this->db->get();
//echo $this->db->last_query();
return $result->row();
这是正确的方法吗?
最佳答案
试试这个
<?php
$query="from_id, (SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=1) AS sent_unread,
(SELECT COUNT(id) FROM user_messages WHERE from_id=1223 AND status=2) AS sent_read";
$query_run=$this->db->select($query);
$query_run->where('from_id', $member_id);
$query_run->group_by('from_id');
$result = $query_run->get('user_messages');
//echo $this->db->last_query();
return $result->row();
?>
关于php - 如何为此查询在 codeigniter 事件记录中编写子查询,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33052521/