Natural right join

Natural right join

Posted in : Core Java Posted on : October 18, 2010 at 6:33 PM Comments : [ 0 ]

This section contains the detail about the Natural right join in java.

Natural right join

n Natural Right join, both table are merge to each other according to common field, but the priority is given to the Second table's field values  means a Right join returns all the values from the right table and matched values from the left table (NULL in case of no matching join predicate).

In Right join, every row of left table appears at least once in joined table, If no matching row from the "Left" table exists, NULL will appear in columns from Left Table for those records that have no match in Right Table.

Query for Right Join


The two tables before Right join --

"employee" table   

 "emp_sal" table

import java.sql.*;

public class natrightjoin{
public static void main(String[] args) {
System.out.println("NATURAL RIGHT JOIN");
Connection con = null;
con = DriverManager.getConnection("jdbc:mysql://","root","root");
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT *FROM "+"employee"+" NATURAL RIGHT JOIN "+"emp_sal"); 
//Natural Right Join two tables
System.out.println("Emp_code" + "\t" + "Emp_name" + "\t" + "Emp_salary"+"\t"+"Emp_designation");
int code = res.getInt("Emp_code");
String name = res.getString("Emp_name");
String sal = res.getString("Emp_salary");
String post = res.getString("Emp_designation");

System.out.println(code + "\t\t" + name + "\t\t" + sal+"\t\t"+post);
catch (SQLException s){
System.out.println("SQL statement is not executed!");
catch (Exception e){

Output :

C:\Program Files\Java\jdk1.6.0_18\bin>java NatJoin
Table after Natural Join
Emp_code        Emp_name     Emp_salary          Emp_designation
1642                ankit               4 lakhs                 PROJECT LEADER
1643                nitesh              3 lakhs                 PROJECT MANAGER
1644                rahul               2.5 lakhs              PROGRAMMER

Download Source Code

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