Php 如何对codeigniter数据库类中的列求和?
如果日期介于某个预定义日期之间,我希望对列数据求和 我用核心php做这件事就像Php 如何对codeigniter数据库类中的列求和?,php,mysql,codeigniter,mysqli,codeigniter-2,Php,Mysql,Codeigniter,Mysqli,Codeigniter 2,如果日期介于某个预定义日期之间,我希望对列数据求和 我用核心php做这件事就像 SUM(IF(`trl`.`entrydate` between '2015-01-01' and '2015-01-31', `trl`.`itemvalue`, 0)) 那么,如何使用codeigniter和活动记录执行此操作: $this->db->select_sum('data'); $this->db->where("entrydate between 'x' a
SUM(IF(`trl`.`entrydate` between '2015-01-01' and '2015-01-31', `trl`.`itemvalue`, 0))
那么,如何使用codeigniter和活动记录执行此操作:
$this->db->select_sum('data');
$this->db->where("entrydate between 'x' and 'y' ");
$query = $this->db->get('your table');
带查询:
$this->db->query("select SUM(data) from `your table` where entrydate between 'x' and 'y' ");