codeigniter active record加入多个select语句

Question

我无法找到加入多个选项的任何参考，例如下面的活动记录中的查询，有谁知道如何做到这一点？

select a1.act, a1.date, a2.clos
from
(
SELECT count( AccountActiveDate ) act, DATE_FORMAT( AccountActiveDate, '%Y-%m' ) date
FROM customert cust
GROUP BY YEAR( AccountActiveDate ) , MONTH( AccountActiveDate ) 
) a1
join
(
SELECT  count( AccountClosedDate ) clos,  DATE_FORMAT( AccountClosedDate, '%Y-%m' ) date
FROM customert cust2
GROUP BY YEAR( AccountClosedDate) , MONTH( AccountClosedDate) 
) a2
ON a1.date = a2.date

Answer 1

你可以像这样输入sql字符串：

$this->db->query('YOUR QUERY HERE')

示例：

$this->db->query('SELECT * FROM tbl_users WHERE age > 18');