如何使用CodeIgniter INNER JOIN 3表

Question

有人能告诉我如何用PHP加入3表吗？例

SELECT FROM table1, table2,table on INNERJOIN -------------------

让我有3个表.(问题表,答案表和类别表)这是我的网页的示例.

Time remaining 30 minutes(I will get "30 minutes" form Category table)
1. Question (from question table)
2. answer (from answer table)

我不知道如何加入3表.

Answer 1

它应该是那样的,

$this->db->select('*');    
$this->db->from('table1');
$this->db->join('table2', 'table1.id = table2.id');
$this->db->join('table3', 'table1.id = table3.id');
$query = $this->db->get();

根据CodeIgniters活动记录框架