Question

我有以下内容：

with emp_mon as 
(
              select '101' emp_id, to_date('20190101','YYYYMMDD') month_of_project from dual 
    union all select '102', to_date('20190101','YYYYMMDD') from dual 
    union all select '103', to_date('20190101','YYYYMMDD') from dual 
    union all select '101', to_date('20190201','YYYYMMDD') from dual 
    union all select '104', to_date('20190301','YYYYMMDD') from dual 
    union all select '102', to_date('20190301','YYYYMMDD') from dual 
    union all select '105', to_date('20190401','YYYYMMDD') from dual 
    union all select '103', to_date('20190401','YYYYMMDD') from dual 
),
mons as
(
    select distinct month_of_project
    from  emp_mon
)
select mons.month_of_project, count(distinct emp_first_mon.emp_id) cnt_emp_id
from mons
     left outer join
     (
         select emp_id, min(month_of_project) month_of_project
         from emp_mon
         group by emp_id
     ) emp_first_mon on emp_first_mon.month_of_project = mons.month_of_project
group by mons.month_of_project
order by 1

但是我收到以下信息：

/** Load necessary stuff **/
        $this->load->helper('date');

        $this->db->get('site_requests');
        //echo mdate('%Y-%m-%d %H:%i:%s', now());
        //die;
        $this->db->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")");
        $this->db->get();
        print_r($this->db->last_query());

我在做什么错了？

Answer 1

您可以将其放入一个语句中

    $this->db->get_where('site_requests', array('created_for <=', '2019-04-24 18:47:03'));
    print_r($this->db->last_query());

您将需要链接-> result（）或result_array（）或任何输出函数以获取数据返回。

希望这会有所帮助

Answer 2

$this->db->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")");

应该在之后

$this->db->get('site_requests');

Answer 3

尝试使用键值形式：

$this->db->where("created_for <=", "2019-04-24 18:47:03");

Answer 4

您缺少定义查询的FROM部分。我认为您只需要更改代码即可：

    $query = $this->db->from('site_requests')
       ->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")")
       ->get();
    $result = $query->result();
    print_r($result);

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4 个答案: