规范化值

Question

import java.io.*;
import java.sql.*;

public class Sum2{

public static void main(String[] args) {

   System.out.println("Sum of the specific column!");
   Connection con = null;

   try
   {
      Class.forName("com.mysql.jdbc.Driver");
        con=DriverManager.getConnection("jdbc:mysql://localhost:3306/prathi","root","mysql");

    try
    {
     Statement st = con.createStatement();       
     ResultSet res = st.executeQuery("SELECT  Service_ID,SUM(consumer_feedback) FROM  consumer2 group by Service_ID"); 
    while (res.next())
               { 
      int data=res.getInt(1); 
      System.out.println(data);
      System.out.println("\n\n");

      int c1 = res.getInt(2); 

      System.out.print(c1); 
      System.out.println("\n\n");        

     }  
   }

  catch (SQLException s)
   {
    System.out.println("SQL statement is not executed!");
   }
  }


   catch (Exception e)
   {
     e.printStackTrace();
   }

  }
} 

我的输出为

C：＆gt; javac Sum4.java

C：＆gt; java Sum4 具体栏目的总和！ 31

0 0

32

2 2

33

-1 0

我计算了总和。然后我将负值分配为零。我需要对这些值进行归一化，即我必须找到2/2的值。 （首先我会找到总数并将每个值除以总数）。我希望自动模拟任何数字的结果。请给我一些想法

谢谢......

Answer 1

这是你的意思吗？

SELECT Service_ID,SUM(consumer_feedback),Sum(consumer_feedback)/count(*)
 FROM consumer2
 GROUP BY Service_ID