$query = "select sum(people_num) as jeTotal from water_work_list where handle_time between '{$start_time}' and '{$end_time}'";
$result=mysqli_query($link, $query);
if(!$result){
echo retJson(402,'获取异常工单处理总数失败',mysqli_error($link));
exit();
}
while ($row=mysqli_fetch_array($result)){
return $row['jeTotal'];
}
people_num为查询的每条数据中需要累加的字段
jeTotal为输出的结果