Sum of Column in a Database Table

This section describes how we can calculate the sum of specific column data in the database table.

Sum of Column in a Database Table

Sum of Column in a Database Table

     

This section describes how we can calculate the sum of specific column data in the database table. Consider an example of any university where we need to calculate the sum of  numbers achieved by the student.  Either we can do it manually or by using just the simple query. By doing it manually is a very cumbersome work, but by using simple query it can be done very easily. By seeing the example given below you can easily understand how you can get the sum of specific column. Here we are providing you an example.

Description of program:

In the program the first  task we going to do is to establish the connection with MySQL database by using the JDBC driver. When the connection has been established pass the table name and name of that column of which we want to calculate the sum. If the statement gets processed then it shows the sum of the particular column else it will displays a message "SQL statement is not executed!".

Description of code:

SELECT  SUM(col_name)   FROM  table_name:
This code can be used to calculate the sum of specific column in database table.

Here is the code of program:

import java.io.*;
import java.sql.*;

public class SumColumn{
  public static void main(String[] args) {
  System.out.println("Sum of the specific column!");
  Connection con = null;
  int sum = 0;
  String col_name;
  try{
  Class.forName("com.mysql.jdbc.Driver");
  con = DriverManager.getConnection
("jdbc:mysql://localhost:3306/jdbctutorial","root","root");
  try{
  Statement st = con.createStatement();
  BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter table name:");
  String table = bf.readLine();
  System.out.println("Enter column name which have to sum:");
  String col = bf.readLine();
  ResultSet res = st.executeQuery("SELECT SUM"+"("+col+")"+" FROM "+table);
  while (res.next()){
  int c = res.getInt(1);
  sum = sum+c;
  }
  System.out.println("Sum of column = "+sum);
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }
  }
  catch (Exception e){
  e.printStackTrace();
  }
  }
} 

Download this example.

Output of program:

C:\vinod\jdbc\jdbc\jdbc-mysql>javac SumColumn.java

C:\vinod\jdbc\jdbc\jdbc-mysql>java SumColumn
Sum of the specific column!
Enter table name:
emp_sal
Enter column name which have to sum:
Emp_sal
Sum of column = 28100

Tutorials

  1. Mapping MySQL Data Types in Java
  2. Connecting to a MySQL Database in Java
  3. Creating a Database in MySQL
  4. Creating a Database Table
  5. Creating a MySQL Database Table to store Java Types
  6. Description of Database Table
  7. Deleting a Table from Database
  8. Retrieving Tables from a Database
  9. Inserting values in MySQL database table
  10. Retrieving All Rows from a Database Table
  11. Adding a New Column Name in Database Table
  12. Change Column Name of a Table
  13. Make Unique Column in Database Table
  14. Remove Unique Column in Database Table
  15. Arrange a Column of Database Table
  16. Arrange a Column of Database Table
  17. Sum of Column in a Database Table
  18. Deleting All Rows from a Database Table
  19. Delete a Specific Row from a Database Table
  20. Delete a Column from a Database Table
  21. Join tables in the specific database
  22. Join tables with the NATURAL LEFT JOIN operation
  23. Join tables with the NATURAL RIGHT JOIN operation
  24. Cross Join Tables in a Specific Database
  25. Prepared Statement Set Object
  26. Statement Batch Update
  27. Prepared Statement With Batch Update
  28. Select Records Using Prepared Statement
  29. Update Records using Prepared Statement
  30. Inserting Records using the Prepared Statement
  31. Count Records using the Prepared Statement
  32. Deleting Records using the Prepared Statement
  33. Using the Prepared Statement Twice
  34. Set Data Types by using Prepared Statement
  35. Set byte, short and long data types by using the Prepared Statement
  36. Prepared Statement Set Big Decimal
  37. Set Date by using the Prepared Statement
  38. Set Time by using the Prepared Statement
  39. Set Timestamp by using the Prepared Statement
  40. Copy Table in a MySQL Database