如何分别计算一列中的值取决于 codeigniter 中的值？

Question

这是我的 table，我想从这个 table 中计算 attendance_status_id，其中年份 1399 和 attendance_status_id 值相同。例如，在这个 table 中，两个 attendance_status_id 具有相同的值 1，所以当我将它算作 present_status 而另一个 2 算作 absent_status 我该怎么做？

这是我的功能：

 public function get_student_attendance_daily_report($data)
 {
      return $this->db->select('sda.id sda_id,st_id,student.student_id,student.name,last_name,fname,school_class_fa_name,
                year,COUNT(attendance_status_id) as at_s_id,attendance_status_id,date,description')
                    ->from('student_daily_attendance sda')
                    ->join('student', 'student.st_id=sda.student_id')
                    ->join('school_class', 'school_class.school_class_id=sda.school_class_id')
                    ->join('jalali_months', 'jalali_months.id=sda.month_id')
                    ->where('sda.year', $data['edu_year'])
                    ->where('sda.school_class_id', $data['grades'])
                    ->where('sda.class_id', $data['class'])
                    ->order_by('sda.id','desc')
                    ->group_by('sda.student_id,sda.attendance_status_id')
                    ->get()->result_array();
}

结果如下：

array (
    'Total' => 36,
)array (
0 => 
array (
  'sda_id' => '85',
  'st_id' => '858',
  'student_id' => 'S99888',
  'name' => 'ٌsafa',
  'last_name' => 'ahmadi',
  'fname' => 'َabdullah',
  'school_class_fa_name' => 'first class',
  'year' => '1399',
  'at_s_id' => '1',
  'attendance_status_id' => '1',
 
),
.
.
.
10 => 
array (
  'sda_id' => '26',
  'st_id' => '858',
  'student_id' => 'S99888',
  'name' => 'ٌsafa',
  'last_name' => 'ahmadi',
  'fname' => 'َabdullah',
  'school_class_fa_name' => 'first class',
  'year' => '1399',
  'at_s_id' => '1',
  'attendance_status_id' => '2',
  
),
.
.
.
)

如您所见，这两个数组中的所有数据都相同，除了 attendance_status_id。所以我想知道如何在如下视图中查询并在一行中显示它们：

|st_id|student_id|name|last_name|fname|school_class_fa_name|year|at_s_id|attendance_status_id(that value is 1)|attendance_status_id(value is tow)|
|-----|----------|----|---------|-----|--------------------|----|-------|--------------------------------------|----------------------------------|
|858|S99888|safa|ahmadi|abdullah|first class|1399|1|1|2|

Answer 1

您可以使用下面的查询来解决您的问题。

return $this->db->select('sda.id sda_id,st_id,student.student_id,student.name,last_name,fname,school_class_fa_name,
            year,
            SUM(CASE attendance_status_id
                      WHEN "1" THEN 1
                      ELSE 0
                   END) AS present
               , SUM(CASE attendance_status_id
                        WHEN "2" THEN 1
                        ELSE 0
                     END) AS absent
               , SUM(CASE attendance_status_id
                        WHEN "3" THEN 1
                        ELSE 0
                     END) AS sick
                     , SUM(CASE attendance_status_id
                        WHEN "4" THEN 1
                        ELSE 0
                     END) AS st_leave
            ,attendance_status_id,date,description')
                ->from('student_daily_attendance sda')
                ->join('student', 'student.st_id=sda.student_id')
                ->join('school_class', 'school_class.school_class_id=sda.school_class_id')
                ->join('jalali_months', 'jalali_months.id=sda.month_id')
                ->where('sda.year', $data['edu_year'])
                ->where('sda.school_class_id', $data['grades'])
                ->where('sda.class_id', $data['class'])

                ->order_by('sda.id','desc')
                ->group_by('sda.student_id')
                ->get()->result_array();

如何分别计算一列中的值取决于 codeigniter 中的值？

How to count value from one column separately depends on value in codiegniter?

php

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