..

app/services/management/school_data_contrast_service.rb

@@ -27,7 +27,9 @@ class Management::SchoolDataContrastService
     reports = reports.group(:school_id)
     count = reports.count.count
 
-    [count, SchoolDailyReport.find_by_sql(query_report_sql(reports.to_sql))]
+    reports = reports.limit(PAGE_SIZE).offset(offset)
+
+    [count, reports]
   end
 
   private
@@ -55,12 +57,9 @@ class Management::SchoolDataContrastService
 
   def select_columns
     "school_id, school_name,"\
-    "SUM(IF(date BETWEEN '#{format_date(params[:begin_date])}' AND '#{format_date(params[:end_date])}', #{contrast_column}, 0)) total,"\
+    "(@total:=SUM(IF(date BETWEEN '#{format_date(params[:begin_date])}' AND '#{format_date(params[:end_date])}', #{contrast_column}, 0))) total,"\
-    "SUM(IF(date BETWEEN '#{format_date(params[:other_begin_date])}' AND '#{format_date(params[:other_end_date])}', #{contrast_column}, 0)) other_total"
+    "(@other_total:=SUM(IF(date BETWEEN '#{format_date(params[:other_begin_date])}' AND '#{format_date(params[:other_end_date])}', #{contrast_column}, 0))) other_total,"\
-  end
+    "(IF(@other_total - @total = 0, 0.0, round((@other_total - @total) / IF(@total = 0, 1, @total), 5))) percentage,"\
-
+    "(@other_total - @total) increase"
-  def query_report_sql(from_sql)
-    "SELECT reports.*, (other_total - total) increase, (IF(other_total - total = 0, 0.0, round((other_total - total) / IF(total = 0, 1, total), 5))) percentage "\
-    "FROM (#{from_sql}) reports ORDER BY percentage #{sort_direction} LIMIT #{PAGE_SIZE} OFFSET #{offset}"
   end
 end

app/views/managements/schools/_data_contrast_list.html.erb

@@ -17,7 +17,8 @@
     <th width="24%">时段一<br><%= "（#{params[:begin_date]}至#{params[:end_date]}）" %></th>
     <th width="24%">时段二<br><%= "（#{params[:other_begin_date]}至#{params[:other_end_date]}）" %></th>
     <th width="16%" colspan="2">
-      <%= sort_tag('变化情况', name: 'percentage', path: school_data_contrast_managements_path) %>
+      <%#= sort_tag('变化情况', name: 'percentage', path: school_data_contrast_managements_path) %>
+      变化情况
       <br>（  新  增  数   | 新增百分比）
     </th>
   </tr>